OFFSET
1,1
EXAMPLE
Prime 5 = 2^2 + 1 and 2^4 + 1, 2^8 + 1, 2^16 + 1 are Fermat primes.
Prime 2823521 = 464^2 + 1615^2 is a term.
a(n) x y
--------- ---- ----
5 2 1
5 2 1
5 2 1
5 2 1
2823521 1615 464
151062433 9777 7448
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Thomas Ordowski and Altug Alkan, Feb 28 2017
STATUS
approved