%I #11 Apr 02 2014 04:39:49
%S 31,131,151,155,157,158,159,161,166,171,181,206,231,281,406,531,631,
%T 651,655,657,658,659,661,666,671,681,706,731,751,755,757,758,759,761,
%U 766,771,775,777,778,779,785,787,788,789,790
%N Numbers with exactly 3 1's in base 5 expansion.
%H Vincenzo Librandi, <a href="/A023728/b023728.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[ Range[ 800 ], (Count[ IntegerDigits[ #, 5 ], 1 ]==3)& ]
%K nonn,base,easy
%O 1,1
%A _Olivier GĂ©rard_