OFFSET
1,3
COMMENTS
The zero entries are only conjectural.
a(5) > 10000 or 0. Other a(n) = 0 entries have been checked up to k = 7500.
If a(i) = j, then a(j) <= i.
PROG
(PARI) a(n)=k=1; while(!ispseudoprime(k^k+n^n), k++); k
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Derek Orr, Nov 01 2014
STATUS
approved