|
Search: id:A006285
|
|
|
| A006285 |
|
Odd numbers not of form p + 2^x (de Polignac numbers).
(Formerly M5390)
|
|
+0
5
|
|
| 1, 127, 149, 251, 331, 337, 373, 509, 599, 701, 757, 809, 877, 905, 907, 959, 977, 997, 1019, 1087, 1199, 1207, 1211, 1243, 1259, 1271, 1477, 1529, 1541, 1549, 1589, 1597, 1619, 1649, 1657, 1719, 1759, 1777, 1783, 1807, 1829, 1859, 1867, 1927, 1969, 1973
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
For primes see A065381, composites A098237. - Jonathan Vos Post (jvospost3(AT)gmail.com), Jun 19 2008
Contains both primes (A065381) and composites (A098237). - Jonathan Vos Post (jvospost3(AT)gmail.com), Jun 19 2008
|
|
REFERENCES
|
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
D. Wells, The Penguin Dictionary of Curious and Interesting Numbers. Penguin Books, NY, 1986, see #127.
|
|
LINKS
|
T. D. Noe, Table of n, a(n) for n=1..10000
P. Pollack, Analytic and Combinatorial Number Theory Course Notes, p. 193, ex. 5.1.6, p. 216ff.
|
|
MATHEMATICA
|
Do[ i = 0; l = Ceiling[ N[ Log[ 2, n ] ] ]; While[ ! PrimeQ[ n - 2^i ] && i < l, i++ ]; If[ i == l, Print[ n ] ], {n, 1, 2000, 2} ]
|
|
PROGRAM
|
(PARI) isA006285(n, i=1)={ n%2 & until( isprime(n-i) | n<i<<=1, ); i>n } \\ - M. F. Hasler (www.univ-ag.fr/~mhasler), Jun 19 2008
|
|
CROSSREFS
|
Cf. A133122, A098237, A065381.
Cf. A133122, A098237, A065381.
Sequence in context: A153815 A126096 A164966 this_sequence A094933 A156702 A137985
Adjacent sequences: A006282 A006283 A006284 this_sequence A006286 A006287 A006288
|
|
KEYWORD
|
nonn,nice,easy
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com).
|
|
EXTENSIONS
|
More terms from Larry Reeves (larryr(AT)acm.org), Apr 13 2000
Link to Pollack Notes corrected by Rainer Rosenthal (r.rosenthal(AT)web.de), Feb 03 2009
|
|
|
Search completed in 0.003 seconds
|
