A363026 Sum of divisors of 5*n-3 of form 5*k+2.

2, 7, 14, 17, 24, 27, 34, 37, 51, 47, 54, 57, 64, 67, 86, 84, 84, 87, 94, 97, 121, 107, 121, 117, 124, 127, 168, 137, 144, 154, 154, 157, 191, 167, 174, 177, 191, 204, 238, 197, 204, 207, 214, 224, 261, 227, 234, 237, 266, 247, 315, 257, 264, 267, 291, 277, 331, 294, 294, 324, 304, 307, 378, 317, 331, 327

Offset

1,1

Links

Table of n, a(n) for n=1..66.

Formula

a(n) = A284280(5*n-3).

G.f.: Sum_{k>0} (5*k-3) * x^k / (1 - x^(5*k-3)).

Mathematica

a[n_] := DivisorSum[5*n - 3, # &, Mod[#, 5] == 2 &]; Array[a, 100] (* Amiram Eldar, Jul 06 2023 *)

Prog

(PARI) a(n) = sumdiv(5*n-3, d, (d%5==2)*d);

Crossrefs

Cf. A362952, A363025, A363027.

Cf. A284280, A359237, A363030.

Sequence in context: A072120 A247866 A057126 * A319250 A018349 A256798

Adjacent sequences: A363023 A363024 A363025 * A363027 A363028 A363029

Keyword

nonn

Author

Seiichi Manyama, Jul 06 2023

Status

approved