A025322 - OEIS

A025322

Numbers that are the sum of 3 nonzero squares in exactly 2 ways.

27, 33, 38, 41, 51, 57, 59, 62, 69, 74, 75, 77, 83, 90, 94, 98, 102, 105, 107, 108, 113, 117, 118, 121, 122, 123, 125, 132, 137, 138, 139, 141, 147, 152, 154, 155, 158, 164, 165, 170, 177, 178, 181, 187, 195, 197, 203, 204, 210, 211, 213, 214, 217, 218, 226, 228, 229, 236

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..418

Index entries for sequences related to sums of squares

Eric Weisstein's World of Mathematics, Square Number.

MATHEMATICA

okQ[n_]:=Length[Select[PowersRepresentations[n, 3, 2], !MemberQ[ #, 0]&]] ==2; Select[Range[250], okQ] (* Harvey P. Dale, Jul 25 2011 *)

CROSSREFS

Cf. A024796, A025427, A025322, A025323, A025324, A025325, A025326, A025327, A025328, A025329, A025330, A025331, A025332, A025333, A025334, A025335, A025336, A025337, A025338.

Sequence in context: A030134 A290842 A024796 * A151742 A304243 A309063

Adjacent sequences: A025319 A025320 A025321 * A025323 A025324 A025325

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved