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 A278479 #10 Dec 19 2016 11:11:00 %S A278479 0,2,26,11,15,70,66,109,154,478,441,96,3693,15005,66934,99420,18978, %T A278479 43002,55943,972190,1151214,2799146,26801784,46632889,15519397, %U A278479 122101417,210553237,289585489,473093534 %N A278479 a(n) is the smallest k such that the 2-adic valuation of A000041(k) equals n. %C A278479 a(n) is the smallest k such that A278478(k) = n. %C A278479 Next term > 10^9. %H A278479 Joerg Arndt, <a href="http://jjj.de/fxt/demo/seq/#A278479">C++ program for this sequence</a> %Y A278479 Cf. A278478. %K A278479 nonn,more %O A278479 0,2 %A A278479 _Joerg Arndt_, Nov 23 2016