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A025341 Numbers that are the sum of 3 distinct nonzero squares in exactly 3 ways. 1
101, 110, 126, 134, 146, 149, 173, 174, 182, 185, 186, 221, 222, 237, 245, 251, 257, 278, 286, 294, 302, 305, 306, 309, 315, 318, 334, 338, 342, 349, 353, 354, 366, 377, 402, 404, 409, 410, 430, 440, 453, 454, 467, 481, 490, 502, 504, 514, 515, 517, 526, 529, 531, 536 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Israel, Table of n, a(n) for n = 1..1690

Index entries for sequences related to sums of squares

MAPLE

N:= 10^6; # to get all terms <= N

A:= Vector(N):

for a from 1 to floor(sqrt(N/3)) do

  for b from a+1 to floor(sqrt((N-a^2)/2)) do

    c:= [$(b+1) .. floor(sqrt(N-a^2-b^2))]:

    v:= map(t -> a^2 + b^2 + t^2, c):

    A[v]:= map(`+`, A[v], 1)

od od:

select(t -> A[t]=3, [$1..N]); # Robert Israel, Jan 03 2016

CROSSREFS

Sequence in context: A171797 A259300 A025349 * A290725 A255966 A305396

Adjacent sequences:  A025338 A025339 A025340 * A025342 A025343 A025344

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified March 19 23:02 EDT 2019. Contains 321343 sequences. (Running on oeis4.)