This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A045297 #18 May 16 2023 22:07:45 %S A045297 19,23,44,48,69,73,79,84,89,95,96,97,103,108,113,115,116,117,144,148, %T A045297 169,173,194,198,204,209,214,220,221,222,228,233,238,240,241,242,269, %U A045297 273,294,298,319,323,329,334,339,345,346,347 %N A045297 Numbers whose base-5 representation contains exactly one 3 and one 4. %C A045297 Subset of A039292. - _R. J. Mathar_, Oct 20 2008 %t A045297 Select[Range[350],DigitCount[#,5,3]==DigitCount[#,5,4]==1&] (* _Harvey P. Dale_, Feb 24 2013 *) %Y A045297 Cf. A007091. %K A045297 nonn,base %O A045297 1,1 %A A045297 _Clark Kimberling_