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A309153 a(n) = A000203(n)*A001227(n). 0
1, 3, 8, 7, 12, 24, 16, 15, 39, 36, 24, 56, 28, 48, 96, 31, 36, 117, 40, 84, 128, 72, 48, 120, 93, 84, 160, 112, 60, 288, 64, 63, 192, 108, 192, 273, 76, 120, 224, 180, 84, 384, 88, 168, 468, 144, 96, 248, 171, 279, 288, 196, 108, 480, 288, 240, 320, 180, 120, 672, 124, 192, 624, 127, 336, 576, 136, 252, 384 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A001227(n) is denoted by Delta_0(n) in Glaisher 1907.

a(n) = A000203(n) iff n is a power of 2.

LINKS

Table of n, a(n) for n=1..69.

J. W. L. Glaisher, On the representations of a number as the sum of two, four, six, eight, ten, and twelve squares, Quart. J. Math. 38 (1907), 1-62 (see p. 4 and p. 8).

FORMULA

a(n) = sigma(n)*delta(n).

MATHEMATICA

Array[DivisorSum[#, 1 &, OddQ] DivisorSigma[1, #] &, 69] (* Michael De Vlieger, Nov 22 2019 *)

CROSSREFS

Cf. A000079, A000203, A001227, A062354, A062355, A064840.

Sequence in context: A011255 A101297 A224847 * A260310 A122237 A307162

Adjacent sequences:  A309150 A309151 A309152 * A309154 A309155 A309156

KEYWORD

nonn,mult,easy

AUTHOR

Omar E. Pol, Jul 14 2019

STATUS

approved

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Last modified August 14 01:55 EDT 2020. Contains 336476 sequences. (Running on oeis4.)