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A281877
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Numbers that are a primitive sum of two squares in more than 2 ways.
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3
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1105, 1885, 2210, 2405, 2465, 2665, 3145, 3445, 3485, 3770, 3965, 4505, 4745, 4810, 4930, 5185, 5330, 5365, 5525, 5785, 5945, 6205, 6290, 6305, 6409, 6565, 6890, 6970, 7085, 7345, 7565, 7585, 7685, 7930, 8177, 8245, 8585, 8845, 8905, 9010, 9061, 9265, 9425, 9490, 9605, 9685, 9805
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OFFSET
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1,1
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COMMENTS
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"Primitive" means that x and y are coprime in the representations x^2+y^2.
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LINKS
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MAPLE
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N:= 10^4: # to get all terms <= N
V:= Vector(N):
for a from 1 to floor(sqrt(N)) do
for b from 1 to min(a, floor(sqrt(N-a^2))) do
if igcd(a, b) > 1 then next fi;
r:= a^2 + b^2;
V[r]:= V[r]+1;
od od:
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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