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%I #14 Sep 05 2024 14:13:57
%S 5,37,4651,1273609
%N Primes of the form (k+1)^k - k^k.
%C a(5) has 372 decimal digits.
%o (PARI) f(n) = for(x=1,n,y=(x+1)^x-x^x; if(isprime(y),print1(y" ")))
%Y The values of k are in A098463.
%Y Primes in A055869.
%Y Cf. A085682.
%K nonn
%O 1,1
%A _Cino Hilliard_, Aug 21 2003