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 A359240 Number of divisors of 4*n-3 of form 4*k+3. 6
 0, 0, 1, 0, 0, 2, 0, 0, 2, 0, 0, 2, 1, 0, 2, 0, 0, 2, 0, 2, 2, 0, 0, 2, 0, 0, 4, 0, 0, 2, 1, 0, 2, 2, 0, 2, 0, 0, 2, 0, 2, 4, 0, 0, 2, 0, 0, 4, 0, 0, 2, 0, 2, 2, 2, 0, 3, 0, 0, 2, 0, 2, 2, 2, 0, 2, 0, 0, 4, 0, 0, 4, 0, 0, 4, 2, 0, 2, 0, 0, 2, 0, 2, 2, 0, 2, 4, 0, 0, 4 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 LINKS Seiichi Manyama, Table of n, a(n) for n = 1..10000 FORMULA a(n) = A001842(4*n-3). G.f.: Sum_{k>0} x^(3*k)/(1 - x^(4*k-1)). PROG (PARI) a(n) = sumdiv(4*n-3, d, d%4==3); (PARI) my(N=100, x='x+O('x^N)); concat([0, 0], Vec(sum(k=1, N, x^(3*k)/(1-x^(4*k-1))))) CROSSREFS Cf. A359239, A359241. Cf. A001842. Sequence in context: A096142 A216921 A344982 * A280285 A033719 A171608 Adjacent sequences: A359237 A359238 A359239 * A359241 A359242 A359243 KEYWORD nonn,easy AUTHOR Seiichi Manyama, Dec 22 2022 STATUS approved

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Last modified May 28 21:07 EDT 2023. Contains 363028 sequences. (Running on oeis4.)