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A236932 Number of integer solutions to a^2 + b^2 + c^2 + 7*d^2 = n. 9
1, 6, 12, 8, 6, 24, 24, 2, 24, 54, 40, 36, 56, 72, 48, 24, 66, 96, 84, 40, 72, 144, 24, 12, 120, 102, 120, 80, 98, 132, 72, 64, 84, 240, 160, 48, 198, 180, 120, 72, 136, 240, 240, 84, 84, 312, 120, 96, 248, 246, 180, 96, 216, 228, 240, 80, 156, 360, 216, 120, 168 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..60.

MAPLE

See A236924.

MATHEMATICA

For number of solutions to a^2+b^2+c^2+k*d^2=n for k=1, 2, 3, 4, 5, 6, 7, 8, 12 see A000118, A236928, A236926, A236923, A236930, A236931, A236932, A236927, A236933.

CROSSREFS

Sequence in context: A005875 A236933 A236927 * A281484 A236931 A028659

Adjacent sequences:  A236929 A236930 A236931 * A236933 A236934 A236935

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 16 2014

STATUS

approved

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Last modified May 23 18:24 EDT 2017. Contains 286926 sequences.