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A283078 a(n) = sigma(7*n). 9
8, 24, 32, 56, 48, 96, 57, 120, 104, 144, 96, 224, 112, 171, 192, 248, 144, 312, 160, 336, 228, 288, 192, 480, 248, 336, 320, 399, 240, 576, 256, 504, 384, 432, 342, 728, 304, 480, 448, 720, 336, 684, 352, 672, 624, 576, 384, 992, 400, 744, 576, 784, 432, 960 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

EXAMPLE

For n = 3, the divisors of 3*7 are {1, 3, 7, 21}. Now, 1 + 3 + 7 + 21 = 32. So, a(3) = 32. - Indranil Ghosh, Feb 28 2017

MATHEMATICA

Table[DivisorSigma[1, 7n], {n, 1, 54}] (* Indranil Ghosh, Feb 28 2017 *)

PROG

(PARI) a(n) = sigma(7*n) \\ Indranil Ghosh, Feb 28 2017

CROSSREFS

Sigma(k*n): A000203 (k=1), A062731 (k=2), A144613 (k=3), A193553 (k=4), A224613 (k=6), this sequence (k=7).

Sequence in context: A044069 A028628 A128690 * A319528 A140403 A108578

Adjacent sequences:  A283075 A283076 A283077 * A283079 A283080 A283081

KEYWORD

nonn

AUTHOR

Seiichi Manyama, Feb 28 2017

STATUS

approved

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Last modified January 22 13:41 EST 2020. Contains 331149 sequences. (Running on oeis4.)