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A282455
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Repdigit numbers that are the sum of two nonzero squares.
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0
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OFFSET
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1,1
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COMMENTS
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This sequence is complete - there are no other terms.
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LINKS
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FORMULA
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EXAMPLE
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666 = 15^2 + 21^2, therefore 666 is a term.
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PROG
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(Magma) lst:=[]; for e in [1..3] do a:=Truncate((10^e-1)/9); for x in [1..9] do n:=a*x; f:=Factorization(n); if IsSquare(n) and not IsZero([x: x in [1..#f] | f[x][1] mod 4 eq 1]) or not IsSquare(n) and IsZero([x: x in [1..#f] | IsOdd(f[x][2]) and f[x][1] mod 4 eq 3]) then Append(~lst, n); end if; end for; end for; lst;
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CROSSREFS
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KEYWORD
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nonn,base,fini,full
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AUTHOR
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STATUS
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approved
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