OFFSET
1,1
COMMENTS
Squarefree numbers that are the sum of two nonzero squares in more than one way.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
FORMULA
EXAMPLE
65 is a term because 65 = 5*13 = 1^2 + 8^2 = 4^2 + 7^2.
PROG
(PARI) isA007692(n) = {nb = 0; lim = sqrtint(n); for (x=1, lim, if ((n-x^2 >= x^2) && issquare(n-x^2), nb++); ); nb >= 2; }
lista(nn) = for(n=1, nn, if(isA007692(n) && issquarefree(n), print1(n, ", ")));
CROSSREFS
KEYWORD
nonn
AUTHOR
Altug Alkan, Jun 07 2016
STATUS
approved