|
%I #2 Mar 31 2012 13:20:34
%S 1,2,3,20,103
%N Numbers k such that k^2 is a term of A120329.
%C a(n)^2 = {1, 4, 9, 400, 10609, ...} are the perfect squares in A120329 and A121166. A120329 = {1, 4, 6, 9, 10, 12, 22, 45, 400, 417, 561, 620, ...} Nonprime integers n such that n divides A120492(n). A121166 = {1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 17, 19, 22, 23, 29, 31, ...} Integers n such that n divides A120492[n] = 1 + Sum[ Prime[k]^(n-1), {k,1,n}].
%Y Cf. A120492, A120329, A121166.
%K hard,more,nonn
%O 1,2
%A _Alexander Adamchuk_, Feb 03 2007
|
