1,2

A122735(n) = {1, 7, 17, 1, 6102977801, 162287, 79792265017612001, ...} Smallest prime of the form (n^k - k^n) for k>1, or 1 if such prime does not exist. Currently a(n) is not known for n = {17,18,22,25,26,27,28,...}.

Table of n, a(n) for n=1..16.

Cf. A122735.

Sequence in context: A227966 A021653 A020847 * A325221 A129522 A133842

Adjacent sequences: A128352 A128353 A128354 * A128356 A128357 A128358

hard,more,nonn

Alexander Adamchuk, Mar 05 2007

approved