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A283076
Smallest odd prime of the form x^2 + y^2 such that x^(2^k) + y^(2^k) is prime for all k = 1 to n.
0
5, 5, 5, 5, 2823521, 151062433
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
Sequence in context: A024729 A046271 A341600 * A046263 A092279 A159002
KEYWORD
nonn,more
AUTHOR
Thomas Ordowski and Altug Alkan, Feb 28 2017
STATUS
approved