Prime p1 of the form a^b - c^d = p1, where a, b, c, d are primes and a + b + c + d = p2, where p2 (A164064) is prime and conc(abcd) = p3 (concatenation of a, b, c, d) is also prime (A164065).
3, 19, 27743, 29663, 101281, 130729, 81535
1 seqfan posts
Tue Apr 27 19:27:35 CEST 2010 [seqfan] Sequences with a^b +/- c^d