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 A359327 Number of divisors of 6*n-5 of form 6*k+5. 6
 0, 0, 0, 0, 1, 0, 0, 0, 0, 2, 0, 0, 0, 0, 2, 0, 0, 0, 0, 2, 1, 0, 0, 0, 2, 0, 0, 0, 0, 2, 0, 2, 0, 0, 2, 0, 0, 0, 0, 2, 0, 0, 2, 0, 2, 0, 0, 0, 1, 2, 0, 0, 0, 2, 2, 0, 0, 0, 0, 2, 0, 0, 0, 0, 4, 2, 0, 0, 0, 2, 0, 0, 0, 0, 2, 2, 0, 0, 0, 2, 0, 0, 2, 0, 2, 0, 2, 0, 1, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,10 LINKS Seiichi Manyama, Table of n, a(n) for n = 1..10000 FORMULA a(n) = A319995(6*n-5). G.f.: Sum_{k>0} x^(5*k)/(1 - x^(6*k-1)). MATHEMATICA a[n_] := DivisorSum[6*n-5, 1 &, Mod[#, 6] == 5 &]; Array[a, 100] (* Amiram Eldar, Aug 14 2023 *) PROG (PARI) a(n) = sumdiv(6*n-5, d, d%6==5); (PARI) my(N=100, x='x+O('x^N)); concat([0, 0, 0, 0], Vec(sum(k=1, N, x^(5*k)/(1-x^(6*k-1))))) CROSSREFS Cf. A319995, A359305, A359324, A359325, A359326. Cf. A359239, A359240, A359241. Sequence in context: A254612 A363886 A227189 * A234859 A001343 A022882 Adjacent sequences: A359324 A359325 A359326 * A359328 A359329 A359330 KEYWORD nonn,easy AUTHOR Seiichi Manyama, Dec 25 2022 STATUS approved

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Last modified August 4 08:16 EDT 2024. Contains 374905 sequences. (Running on oeis4.)