%I A128355
%S A128355 0,5,4,0,14,7,20,11,10,273,14,13,38,89,68,0
%N A128355 Numbers k such that A122735(n) = n^k - k^n.
%C A128355 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,...}.
%Y A128355 Cf. A122735.
%Y A128355 Sequence in context: A021189 A021653 A020847 this_sequence A129522 A133842 
               A115637
%Y A128355 Adjacent sequences: A128352 A128353 A128354 this_sequence A128356 A128357 
               A128358
%K A128355 hard,more,nonn
%O A128355 1,2
%A A128355 Alexander Adamchuk (alex(AT)kolmogorov.com), Mar 05 2007