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 A045282 #15 Dec 27 2024 16:17:21 %S A045282 14,22,39,47,54,59,69,70,71,73,89,97,102,107,110,111,113,117,139,147, %T A045282 164,172,179,184,194,195,196,198,214,222,227,232,235,236,238,242,254, %U A045282 259,269,270,271,273,279,284,294,295,296,298 %N A045282 Numbers whose base-5 representation contains exactly one 2 and one 4. %C A045282 Subset of A039291. - _R. J. Mathar_, Oct 20 2008 %t A045282 Select[Range[300],DigitCount[#,5,2]==DigitCount[#,5,4]==1&] (* _Harvey P. Dale_, Dec 27 2024 *) %Y A045282 Cf. A007091, A039291. %K A045282 nonn,base %O A045282 1,1 %A A045282 _Clark Kimberling_