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A025322 Numbers that are the sum of 3 nonzero squares in exactly 2 ways. 19
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
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
Sequence in context: A030134 A290842 A024796 * A151742 A304243 A309063
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 19 07:49 EDT 2024. Contains 370958 sequences. (Running on oeis4.)