[seqfan] x^(y + 1) - y^x

[юрий герасимов]

Dear SeqFans, 

primes of the form x^(y + 1) - y^x for positive x and y :

7 (x = 2, y = 3), 

19 (x = 3, y = 2), 

179 (x = 3, y = 4), 

543607 (x = 7, y = 6), ....

What in the next one? 

JSG