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A050466 a(n) = Sum_{d|n, n/d=3 mod 4} d^3. 2
0, 0, 1, 0, 0, 8, 1, 0, 27, 0, 1, 64, 0, 8, 126, 0, 0, 216, 1, 0, 370, 8, 1, 512, 0, 0, 730, 64, 0, 1008, 1, 0, 1358, 0, 126, 1728, 0, 8, 2198, 0, 0, 2960, 1, 64, 3402, 8, 1, 4096, 343, 0, 4914, 0, 0, 5840, 126, 512, 6886, 0, 1, 8064, 0, 8, 9991, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

COMMENTS

a(n) = 0: 1, 2, 4, 5, 8, 10, 13, 16, 17, 20, 25, ..., A072437. - Robert G. Wilson v, Mar 26 2015

a(n) = 1: 3, 7, 11, 19, 23, 31, 43, 47, 59, 67, ..., A002145. - Robert G. Wilson v, Mar 26 2015

LINKS

Robert G. Wilson v, Table of n, a(n) for n = 1..1000

MATHEMATICA

f[n_] := Total[(n/Select[Divisors@ n, Mod[#, 4] == 3 &])^3]; Array[f, 64] (* Robert G. Wilson v, Mar 26 2015 *)

PROG

(PARI) a(n) = sumdiv(n, d, ((n/d % 4)== 3)* d^3); \\ Michel Marcus, Mar 26 2015

CROSSREFS

Sequence in context: A176459 A248878 A168387 * A095893 A095886 A325222

Adjacent sequences:  A050463 A050464 A050465 * A050467 A050468 A050469

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 23 1999

EXTENSIONS

Offset changed from 0 to 1 by Robert G. Wilson v, Mar 27 2015

STATUS

approved

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Last modified November 17 00:08 EST 2019. Contains 329209 sequences. (Running on oeis4.)