Prime p3 of the sequence A164063: a^b - c^d = p1 (A164063), where a, b, c, d are primes and a + b + c + d = p2 (A164064), where p2 is prime and conc(abcd) = p3 (concatenation of a, b, c , d) is also prime.
2753, 3323, 313211, 31327, 217313, 21773, 7721
1 seqfan posts
Tue Apr 27 19:27:35 CEST 2010 [seqfan] Sequences with a^b +/- c^d