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Search: id:A161703
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| A161703 |
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(4*n^3 - 12*n^2 + 14*n + 3)/3. |
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+0
22
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| 1, 3, 5, 15, 41, 91, 173, 295, 465, 691, 981, 1343, 1785, 2315, 2941, 3671, 4513, 5475, 6565, 7791, 9161, 10683, 12365, 14215, 16241, 18451, 20853, 23455, 26265, 29291, 32541, 36023, 39745, 43715, 47941, 52431, 57193, 62235, 67565, 73191, 79121
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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{a(k): 0 <= k < 4} = divisors of 15:
a(n) = A027750(A006218(14) + k + 1), 0 <= k < A000005(15).
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LINKS
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R. Zumkeller, Enumerations of Divisors
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FORMULA
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a(n) = C(n,0) + 2*C(n,1) + 8*C(n,3).
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EXAMPLE
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Differences of divisors of 15 to compute the coefficients of their interpolating polynomial, see formula:
1 ... 3 ... 5 ... 15
.. 2 ... 2 .. 10
..... 0 ... 8
........ 8.
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CROSSREFS
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A005408, A000124, A016813, A086514, A000125, A058331, A002522, A161701, A161702, A000127, A161704, A161706, A161707, A161708, A161710, A080856, A161711, A161712, A161713, A161715, A006261.
Adjacent sequences: A161700 A161701 A161702 this_sequence A161704 A161705 A161706
Sequence in context: A138017 A148503 A145939 this_sequence A018551 A103425 A119472
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 17 2009
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