%I

%S 1,2,3,4,5,6,7,8,9,11,13,15,17,19,21,23,25,29,31,35,37,41,43,47,49,53,

%T 55,59,61,65,67,71,73,77,79,83,85,89,91,97,101,103,107,109,113,119,

%U 121,127,131,137,139,143,149,151,157,163,167,169,173,179,181,187,191

%N Numbers n such that A000001(n) = smallest prime factor of n.

%C A088444(a(n)) = A020639(a(n)).

%K nonn

%O 1,2

%A _Reinhard Zumkeller_, Sep 30 2003