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A181570
Primes in A050798.
1
7, 13, 17, 23, 31, 37, 41, 53, 67, 89, 97, 103, 109, 113, 127, 137, 149, 151, 163, 167, 179, 197, 211, 223, 227, 229, 241, 263, 269, 277, 281, 283, 311, 331, 347, 359, 367, 373, 383, 389, 397, 419, 431, 433, 439, 479, 491, 503, 509, 541, 547, 587, 601, 617, 619, 653, 673, 677, 683, 691, 709
OFFSET
1,1
COMMENTS
Primes p such that p^2 + 1 is expressible as the sum of two nonzero squares in exactly two ways.
FORMULA
A050798 INTERSECTION A000040. {p in A000040 such that A000161(p^2 + 1) = 2}.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Jonathan Vos Post, Jan 29 2011
STATUS
approved