%I A113937
%S A113937 1,9801,16008300,94109401,34346991901,270990840125,903638458801,
%T A113937 8676736387298001
%N A113937 Numbers which are powerful(1) (A001694) and pentagonal (A000326) at the 
               same time.
%C A113937 a(9) > 2^63. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Dec 
               07 2008]
%e A113937 94109401=7921*(3*7921)/2 is the 7921st pentagonal number and 94109401=89^2*109^2.
%Y A113937 Cf. A001694, A000326.
%Y A113937 Sequence in context: A069333 A156721 A156735 this_sequence A036353 A031687 
               A031597
%Y A113937 Adjacent sequences: A113934 A113935 A113936 this_sequence A113938 A113939 
               A113940
%K A113937 nonn
%O A113937 1,2
%A A113937 Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 31 2006
%E A113937 a(8) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Dec 07 2008