OFFSET
1,2
COMMENTS
Terms found with PrimeForm. Primes corresponding to 16, 105 and 119 certified with Primo. 7917 corresponds to a 30870-digit probable prime.
LINKS
Eric Weisstein's World of Mathematics, Integer Sequence Primes
Eric Weisstein's World of Mathematics, Power Difference Prime
EXAMPLE
17^17 - 16^16 = 808793517812627212561, which is prime, so 16 is a term.
MATHEMATICA
Select[Table[n, {n, 8000}], PrimeQ[(#+1)^(#+1)-#^#]&] (* Vladimir Joseph Stephan Orlovsky, Mar 03 2011*)
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
Rick L. Shepherd, May 21 2008
STATUS
approved