Chacon sequences: A049320 *, A049321 *
Chains:: A007047 , A005603 , A005602
challenge problems, see sequences that need extending
Champernowne , sequences related to (start):
Champernowne constant: A033307 *, A030167 *, A058068 , A058069 , A007376 , A033308
Champernowne sequence: A030190 *, A030302
change ringing: see bell ringing
character tables: see also degrees of irreducible representations
characteristic functions , sequences related to (start):
characteristic functions (000): char fn where where name of "chi_n=1"
characteristic functions (001): chi chi_n=1 chi_n=0
characteristic functions (002): A000007 A000004 A000027 all 0
characteristic functions (003): A000012 A001477 [empty] natural numbers
characteristic functions (004): A000035 A005408 A005843 odd numbers
characteristic functions (005): A003849 A003622 A022342
characteristic functions (006): A004641 A086377 A081477
characteristic functions (007): A005171 A018252 A000040 nonprimes
characteristic functions (008): A005369 A002378 A078358 pronic numbers
characteristic functions (009): A005614 A022342 A003622
characteristic functions (010): A008966 A005117 A013929 squarefree
characteristic functions (011): A010051 A000040 A018252 primes
characteristic functions (012): A010052 A000290 A000037 squares
characteristic functions (013): A010054 A000217 A014132 triangular numbers
characteristic functions (014): A010055 A000961 A024619 prime powers
characteristic functions (015): A010056 A000045 A001690 Fibonacci numbers
characteristic functions (016): A010057 A000578 A007412 cubes
characteristic functions (017): A010058 A000108 A092459 Catalan numbers
characteristic functions (018): A010059 A001969 A000069 evil numbers
characteristic functions (019): A010060 A000069 A001969 odious numbers
characteristic functions (020): A011655 A001651 A008585 not mult 3
characteristic functions (021): A012245 A000142 A063992 factorials
characteristic functions (022): A014306 A145397 A000292 m(m+1)(m+2)6
characteristic functions (023): A014578 A007417 A145204
characteristic functions (024): A020987 A022155 NA
characteristic functions (025): A023531 A000096 A007401 m(m+3)2
characteristic functions (026): A023533 A000292 A145397 m(m+1)(m+2)6
characteristic functions (027): A033683 A104777 NA odd squares mod 3 > 0
characteristic functions (028): A033684 A135556 NA squares mod 3 > 0
characteristic functions (029): A035263 A003159 A036554
characteristic functions (030): A036987 A000225 NA
characteristic functions (031): A038189 A091067 A091072
characteristic functions (033): A057427 A000027 A000004 positive numbers
characteristic functions (034): A059448 A059009 A059010
characteristic functions (035): A059841 A005843 A005408 even numbers
characteristic functions (036): A063524 A000012 A087156 all 1
characteristic functions (037): A064911 A001358 A100959 semiprimes
characteristic functions (038): A065043 A028260 A026424 even number of prime factors
characteristic functions (039): A065202 A065201 A065200
characteristic functions (040): A065333 A003586 A059485 3-smooth
characteristic functions (041): A066247 A002808 A008578 composite numbers
characteristic functions (042): A066829 A026424 A028260 odd number of prime factors
characteristic functions (043): A072401 A004215 NA of the form 4^m*(8k+7)
characteristic functions (044): A075802 A001597 A007916 perfect powers
characteristic functions (045): A075897 A048645 NA
characteristic functions (046): A079260 A002144 A137409 primes of form 4n+1
characteristic functions (047): A079261 A002145 A145395 primes of form 4n+3
characteristic functions (048): A079978 A008585 A001651 mult 3
characteristic functions (049): A079979 A008588 A047253 mult 6
characteristic functions (050): A079998 A008587 A047201
characteristic functions (051): A080110 A080112 A080113
characteristic functions (052): A080111 A080113 A080112
characteristic functions (053): A080116 A014486 NA
characteristic functions (054): A080339 A008578 A002808 {1} union {primes}
characteristic functions (055): A080545 A006005 A065090 {1} union {odd primes}
characteristic functions (056): A080995 A001318 A118300 gen. pentagonal numbers
characteristic functions (057): A082784 A008589 A047304 mult 7
characteristic functions (058): A083187 A002379 NA [ 3^n 2^n ]
characteristic functions (059): A083923 A057548 NA
characteristic functions (060): A083924 A072795 NA
characteristic functions (061): A085357 A003714 A004780 Fibbinary numbers
characteristic functions (062): A086299 A002473 A068191 7-smooth
characteristic functions (063): A088517 A001463 NA
characteristic functions (064): A089011 A005763 NA Weyl
characteristic functions (065): A091225 A014580 NA
characteristic functions (066): A091247 A091242 NA
characteristic functions (067): A092248 A030230 A030231 even number of distinct prime factors
characteristic functions (068): A093709 A028982 A028983 squares or twice squares
characteristic functions (069): A093719 A047273 A047235 (mod 2)^(mod 3)
characteristic functions (070): A095076 A020899 A095096
characteristic functions (071): A095111 A095096 A020899
characteristic functions (072): A098108 A016754 NA
characteristic functions (073): A099104 A066680 NA badly sieved numbers
characteristic functions (074): A099395 A007283 NA
characteristic functions (075): A101040 NA NA not more than 2 prime factors
characteristic functions (076): A101605 A014612 NA exactly 3 prime factors
characteristic functions (077): A101637 A014613 NA exactly 4 prime factors
characteristic functions (078): A102460 A000032 NA Lucas numbers
characteristic functions (079): A103673 A103676 A103677 (factorial)
characteristic functions (080): A103674 A103678 A103679 (factorial)
characteristic functions (081): A103675 A103680 A103681 (factorial)
characteristic functions (082): A105349 A000129 NA Pell numbers
characteristic functions (083): A107078 A013929 A005117 non unitary divisors
characteristic functions (084): A112526 A001694 A052485 powerful numbers
characteristic functions (085): A114986 A000201 A001950
characteristic functions (086): A118952 A118957 A118956
characteristic functions (087): A121262 A008586 A042968 mult 4
characteristic functions (088): A122255 A122254 A048136
characteristic functions (089): A122257 A005109 A122259 Pierpont primes
characteristic functions (090): A122261 A122260 NA mult. closure of Pierpont primes
characteristic functions (091): A122895 A123240 NA tau=Fibonacci
characteristic functions (092): A123927 A119885 NA tau=Lucas
characteristic functions (093): A130638 A005237 NA tau(n+1)=tau(n)
characteristic functions (094): A132138 A002977 A132142
characteristic functions (095): A133010 NA NA
characteristic functions (096): A133011 NA NA
characteristic functions (097): A133100 A085787 NA gen. heptagonal numbers
characteristic functions (098): A133101 A057569 NA
characteristic functions (099): A133872 A042948 A042964 congruent 0 or 1 mod 4
characteristic functions (100): A136522 A002113 A029742 palindrome
characteristic functions (101): A137794 A073491 A073492 no prime gaps in fact.
characteristic functions (102): A139689 NA NA Chen
characteristic functions (103): A141260 A141259 NA
characteristic functions (104): A143731 A024619 A000961 more than 1 prime factor
characteristic functions (105): A145649 A000959 A050505 lucky numbers
characteristic functions (106): A156660 A005384 A138887 Sophie Germain primes
characteristic functions (107): A156659 A005385 A156657 safe primes
characteristic functions (108): A079559 A005187 A055938 range of A005187
characteristic functions (109): A151774 A018900 A161989 numbers with binary weight 2
characters of groups: A005368
characters, see also under symmetric group
Chebycheff is spelled Chebyshev throughout
Chebychev is spelled Chebyshev throughout
Chebyshev function theta(n): A035158 , A057872 , A083535
Chebyshev polynomials , sequences related to (start):
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 1): A001792 A001793 A001794 A002698 A005583 A005584 A006974 A006975 A006976 A007701 A008310 A008311
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 2): A020537 A020538 A020539 A039991 A053120 A001105 A002415 A002492 A005585 A040977 A050486 A008314
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 3): A053347 A054322 A054323 A054324 A054325 A054326 A054327 A054328 A054329 A054330 A054331 A054332
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 4): A054333 A054334 A001653 A070997 A001091 A072256 A001075 A001541 A005248 A003501 A056854 A056918
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 5): A057076 A001079 A023038 A011943 A023039 A001081 A001085 A077235 A077236 A077237 A077238 A077239
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 6): A077240 A077242 A077244 A077246 A077248 A077250 A077409 A077411 A001570 A001835 A056771 A077417
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 7): A077420 A077422 A077424 A077428 A078356 A078363 A078365 A078367 A078369 A000129 A001333 A001076
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 8): A001077 A005667 A005668 A041025 A078986
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 9): A090733 A090248 A090251 A001519 A097308 -A097316 A097725 -A097742 A097765 -A097784 A097826 -A097835
Chebyshev polynomials of the first kind (T- or C- polynomials) (10): A090729 A090731 A097837 A097838 A097840 -A097845 A098244 A098246 A098247
Chebyshev polynomials of the first kind (T- or C- polynomials) (11): A098249 A098250 A098252 A098253 A098255 A098256 A098258 A098259 A098261 A098262 A098291 A098292 A078070 A004146 A007877 A054493 A011655 A011655 A049683
Chebyshev polynomials of the first kind (T- or C- polynomials) (12): A098249 A049684 A095004 A098296 -A098299 A098300 -A098310 A005386 A092936 A099270 -A099273 A099275 -A099279 A099365 -A099374 A099368 A099397 A001108 A007598 A079291
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 1): A001787 A001788 A001789 A002605 A003472 A008312 A008313 A008315 A010892 A020540 A020541 A020542
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 2): A030195 A030191 A030221 A030192 A030240 A049310 A049347 A053117 A053118 A053119 A053121 A002700
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 3): A053122 A051323 A053124 A053125 A053126 A053127 A053128 A053129 A053130 A053131 A001653 A001109
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 4): A054450 A001090 A001353 A018913 A004187 A004254 A004189 A001834 A002878 A002315 A056594
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 5): A057076 A057077 A057078 A057079 A057080 A057081 A001906 A056854 A056918
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 6): A057083 A057084 A057085 A057086 A057087 A057088 A057089 A057090 A057091 A057092 A057093 A057094
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 7): A025170 A025171 A004190 A001653 A070997 A001091 A072256 A054320 A004189 A001075 A005248 A003501
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 8): A054491 A054488 A023038 A004191 A007655 A011943 A049660 A023039 A001081 A001085 A075843 A077234
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 9): A077237 A077413 A077241 A077243 A077245 A077247 A077249 A077251 A077410 A077412
Chebyshev polynomials of the second kind (U- or S- polynomials) (10): A028230 A001835 A029547 A046176 A029548 A077416 A077418 A077420 A077421 A077422 A077423
Chebyshev polynomials of the second kind (U- or S- polynomials) (11): A077424 A077428 A078356 A078362 A078363 A078364 A078365 A078366 A078367 A078368 A078369
Chebyshev polynomials of the second kind (U- or S- polynomials) (12): A000129 A001333 A001076 A001077 A005667 A005668 A041025 A078986 A078987
Chebyshev polynomials of the second kind (U- or S- polynomials) (13): A092499 A090733 A090248 A090251 A001519 A078922 A092521 A092420 A076765 A076139 A049664
Chebyshev polynomials of the second kind (U- or S- polynomials) (14): A097726 A097727 A097729 A097730 A097732 A097733 A097735 A097736 A097738 A097739 A097741 A097742 A097766 A097767 A097769 A097770
Chebyshev polynomials of the second kind (U- or S- polynomials) (15): A090729 A090731 A097834 -A097845 A098244 -A098263 A098291 A098292 A078070 A004146 A007877 A099368 A041041 A052918 A054413 A054493 A098301
Chebyshev polynomials: see also A002680
checkers, sequences related to (start):
checkers: A055213 , A133046 , A133047
Chernoff sequence: A006939 *, A051357
chess, number of games , sequences related to (start):
chess, number of games , definition: position = position with castling and en passant information, diagram = position without castling and en passant information
chess, number of games: A048987 * A079485 A006494 A089956
chess, number of games: see also A007747 A007545 A007577
chess, number of diagrams: A019319 * A090051
chess, number of positions: A083276 * A057745 A089957
chessboard, halving a: A003155
chessboard, quartering a: A006067 , A003213
Chinese: see also Index entries for sequences related to number of letters in n
chord diagrams, sequences related to (start):
chord diagrams: (1) A007293 A007473 A007474 A007769 A014595 A018191 A018192 A018193 A018225 A022489 A022490 A022491 A022492
chord diagrams: (2) A022493 A022494 A054499 A054938
chords in a circle: A001006 , A054726 , A006533 , A000124
chords in a circle: see also Poonen-Rubinstein paper
Chowla sequence: see Mian-Chowla sequences
Chowla's function: sum of divisors excluding 1 and n: A048050 *, A002954
chromatic number of graphs: A006670 , A006671
chromatic number of surface: A000703 *, A000934 *, A059103
Chvatal conjecture, sequences related to (start):
Chvatal conjecture: A007008
circle problem: A057655 *
circle product: A101330
circles, number of ways of arranging: A000081
circuits: A002631 , A002632