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 A257090 #11 Apr 16 2015 15:27:24 %S A257090 0,2,2,5,2,4,2,7,5,4,2,7,2,4,4,11,2,7,2,7,4,4,2,9,5,4,7,7,2,6,2,13,4, %T A257090 4,4,10,2,4,4,9,2,6,2,7,7,4,2,13,5,7,4,7,2,9,4,9,4,4,2,9,2,4,7,16,4,6, %U A257090 2,7,4,6,2,12,2,4,7,7,4,6,2,13,11,4,2,9,4,4,4,9,2,9,4,7,4,4,4,15,2,7,7,10 %N A257090 a(n) = log_2 (A256691(n)). %C A257090 a(n) is the logarithm to the base 2 of the denominator of the Dirichlet series of zeta(s)^(1/4). For details, see A256691. %H A257090 Wolfgang Hintze, <a href="/A257090/b257090.txt">Table of n, a(n) for n = 1..500</a> %F A257090 2^a(n) = A256691(n). %Y A257090 Cf. A046645 (k = 2, log_2), A257089 (k = 3, log_3), A257090 (k = 4, log_2), A257091 (k = 5, log_5). %K A257090 nonn %O A257090 1,2 %A A257090 _Wolfgang Hintze_, Apr 16 2015