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Search: id:A161700
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| A161700 |
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a(n) = EDP(n,tau(n)) with tau = A000005 and EDP(n,x) = interpolating polynomial for the divisors of n. |
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32
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| 1, 3, 5, 7, 9, 13, 13, 15, 19, 17, 21, 28, 25, 21, 41, 31, 33, 59, 37, 21, 53, 29, 45, 39, 61, 33, 65, 49, 57, 171, 61, 63, 77, 41, 117, 61, 73, 45, 89, -57, 81, 309, 85, 105, 167, 53, 93, -80, 127, 61, 113, 133, 105, 321, 173, 183, 125, 65, 117, -1039, 121, 69, 155, 127, 201, 333, 133, 189, 149, -69, 141, 117, 145, 81, 317, 217, 269
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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EDP(n,A000005(n) - 1) = n;
EDP(n,1) = A020639(n);
EDP(n,0) = 1;
EDP(n,k) = A027750(A006218(n-1)+k+1), 0<=k<A000005(n).
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LINKS
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R. Zumkeller, Enumerations of Divisors
Eric Weisstein's World of Mathematics, Divisor
Eric Weisstein's World of Mathematics, Finite Difference
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EXAMPLE
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n=12: A000005(12)=6;
EDP(12,x) = (x^5 - 5*x^4 + 5*x^3 + 5*x^2 + 114*x + 120)/120 = A161701(x) is the interpolating polynomial for {(0,1),(1,2),(2,3),(3,4),(4,6),(5,12)},
{EDP(12,x): 0<=x<6} = {1, 2, 3, 4, 6, 12} = divisors of 12,
a(12) = EDP(12,6) = 28.
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CROSSREFS
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A000012, A000027, A005408, A000124, A016813, A086514, A016921, A000125, A058331, A002522, A017281, A161701, A017533, A161702, A161703, A000127, A158057, A161704, A161705, A161706, A161707, A161708, A161709, A161710, A080856, A161711, A161712, A161713, A161714, A161715, A128470, A006261.
Cf. A161856.
Sequence in context: A100432 A145341 A121388 this_sequence A063081 A067031 A029740
Adjacent sequences: A161697 A161698 A161699 this_sequence A161701 A161702 A161703
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KEYWORD
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sign
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 17 2009, Jun 20 2009
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