A025343 Numbers that are the sum of 3 distinct nonzero squares in exactly 5 ways.

206, 230, 266, 269, 326, 350, 381, 389, 398, 413, 414, 425, 437, 441, 470, 474, 486, 525, 554, 585, 590, 593, 611, 630, 635, 638, 659, 662, 674, 706, 729, 731, 758, 781, 819, 824, 829, 830, 851, 874, 878, 890, 901, 905, 917, 920, 923, 978, 985, 1006, 1011, 1021, 1035

Offset

1,1

Links

Robert Israel, Table of n, a(n) for n = 1..2380

Index entries for sequences related to sums of squares

Maple

N:= 10^6;
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]=5, [$1..N]); # Robert Israel, Jan 03 2016

Crossrefs

Sequence in context: A261749 A058180 A025351 * A222619 A252270 A113934

Adjacent sequences: A025340 A025341 A025342 * A025344 A025345 A025346

Keyword

nonn

Author

David W. Wilson

Status

approved