%I A031218
%S A031218 1,2,3,4,5,5,7,8,9,9,11,11,13,13,13,16,17,17,19,19,19,19,23,23,25,25,
%T A031218 27,27,29,29,31,32,32,32,32,32,37,37,37,37,41,41,43,43,43,43,47,47,49,
%U A031218 49,49,49,53,53,53,53,53,53,59,59,61,61,61,64,64,64,67,67,67,67,71,71
%N A031218 Largest prime power <= n.
%o A031218 (PARI) a(n)=if(n<1,0, while(matsize(factor(n))[1]>1,n--); n)
%Y A031218 Cf. A000015.
%Y A031218 Sequence in context: A073137 A131233 A136623 this_sequence A163382 A094017 
               A092762
%Y A031218 Adjacent sequences: A031215 A031216 A031217 this_sequence A031219 A031220 
               A031221
%K A031218 nonn,easy
%O A031218 1,2
%A A031218 N. J. A. Sloane (njas(AT)research.att.com).
%E A031218 More terms from Erich Friedman (erich.friedman(AT)stetson.edu).