%I A039420
%S A039420 37,73,137,173,237,273,307,317,327,347,357,367,370,371,372,374,375,376,
%T A039420 378,379,387,397,437,473,537,573,637,673,703,713,723,730,731,732,734,
%U A039420 735,736,738,739,743,753,763,783,793,837,873,937,973,1037,1073
%N A039420 Numbers n such that representation in base 10 has same nonzero number 
               of 3's and 7's.
%Y A039420 Sequence in context: A093838 A055604 A135952 this_sequence A043243 A044023 
               A069204
%Y A039420 Adjacent sequences: A039417 A039418 A039419 this_sequence A039421 A039422 
               A039423
%K A039420 nonn,base,easy
%O A039420 1,1
%A A039420 Olivier Gerard (olivier.gerard(AT)gmail.com)