A050455 - OEIS

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A050455

a(n) = Sum_{d|n, d=3 mod 4} d^4.

0, 0, 81, 0, 0, 81, 2401, 0, 81, 0, 14641, 81, 0, 2401, 50706, 0, 0, 81, 130321, 0, 2482, 14641, 279841, 81, 0, 0, 531522, 2401, 0, 50706, 923521, 0, 14722, 0, 1503026, 81, 0, 130321, 2313522, 0, 0, 2482, 3418801, 14641, 50706, 279841

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OFFSET

1,3

LINKS

Seiichi Manyama, Table of n, a(n) for n = 1..10000

MATHEMATICA

a[n_] := DivisorSum[n, #^4 &, Mod[#, 4]==3 &]; Array[a, 30] (* Amiram Eldar, Dec 06 2018 *)

CROSSREFS

Sequence in context: A116230 A056669 A005085 * A110727 A005068 A366458

Adjacent sequences: A050452 A050453 A050454 * A050456 A050457 A050458

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 23 1999

STATUS

approved