OFFSET
1,9
PROG
(PARI) a(n)=my(b); sum(c=n+2, n^2\2+1, issquare(c^2-n^2, &b) && n<b) \\ Charles R Greathouse IV, Jul 07 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Henry Bottomley, Jun 15 2000
STATUS
approved