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A363858 Number of divisors of 7*n-6 of form 7*k+6. 5
0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 1, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 0, 0, 2, 0, 0, 2, 0, 0, 0, 1, 0, 2, 0, 0, 0, 2, 0, 2, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 2, 4, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,12
LINKS
Table of n, a(n) for n=1..100.
FORMULA
a(n) = A363808(7*n-6).
G.f.: Sum_{k>0} x^(6*k)/(1 - x^(7*k-1)).
MATHEMATICA
a[n_] := DivisorSum[7*n - 6, 1 &, Mod[#, 7] == 6 &]; Array[a, 100] (* Amiram Eldar, Jun 25 2023 *)
PROG
(PARI) a(n) = sumdiv(7*n-6, d, d%7==6);
CROSSREFS
Cf. A361691, A363854, A363855, A363856, A363857.
Cf. A359239, A359241, A359327.
Cf. A363808.
Sequence in context: A055668 A045839 A000086 * A045838 A350139 A293814
Adjacent sequences: A363855 A363856 A363857 * A363859 A363860 A363861
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Jun 24 2023
STATUS
approved

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Last modified August 30 04:38 EDT 2024. Contains 375526 sequences. (Running on oeis4.)