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A293175 Integers with precisely six partitions into sums of four squares of nonnegative numbers. 2
66, 81, 97, 99, 105, 110, 115, 121, 123, 124, 137, 139, 141, 149, 155, 156, 158, 159, 164, 179, 188, 239, 264, 284, 440, 496, 624, 632, 656, 752, 1056, 1136, 1760, 1984, 2496, 2528, 2624, 3008, 4224, 4544, 7040, 7936, 9984, 10112, 10496, 12032, 16896, 18176 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A002635(a(n)) = 6.

LINKS

Table of n, a(n) for n=1..48.

D. H. Lehmer, On the Partition of Numbers into Squares, The American Mathematical Monthly, Vol. 55, No. 8, October 1948, pp. 476-481.

Index entries for sequences related to sums of squares

MATHEMATICA

f[n_] := Length@ PowersRepresentations[n, 4, 2]; Select[ Range@ 19000, f@# == 6 &] (* Robert G. Wilson v, Oct 27 2017 *)

CROSSREFS

Cf. A001156, A002635, A006431, A025428, A180149, A245022, A294282, A294297.

Sequence in context: A128896 A109750 A127654 * A032485 A257029 A223734

Adjacent sequences:  A293172 A293173 A293174 * A293176 A293177 A293178

KEYWORD

nonn

AUTHOR

Robert Price, Oct 27 2017

STATUS

approved

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Last modified October 20 18:19 EDT 2019. Contains 328269 sequences. (Running on oeis4.)