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 A154213 #7 Aug 14 2023 11:05:42 %S A154213 8,1,6,1,8,9,3,0,4,1,0,8,4,3,6,1,6,9,2,0,9,2,3,5,7,4,0,7,0,6,0,8,7,2, %T A154213 5,1,3,4,6,5,1,7,6,6,2,2,3,1,4,0,4,2,3,9,9,9,3,7,3,8,0,5,0,4,9,2,6,8, %U A154213 7,3,1,6,6,9,4,9,8,5,5,1,4,0,6,6,1,6,2,0,5,1,9,2,0,5,6,1,4,2,8 %N A154213 Decimal expansion of log_21 (12). %H A154213 Vincenzo Librandi, <a href="/A154213/b154213.txt">Table of n, a(n) for n = 0..1000</a> %H A154213 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %e A154213 .81618930410843616920923574070608725134651766223140423999373... %t A154213 RealDigits[Log[21, 12], 10, 100][[1]] (* _Vincenzo Librandi_, Sep 07 2013 *) %Y A154213 Cf. decimal expansion of log_21(m): A152825 (m=2), A153097 (m=3), A153131 (m=4), A153455 (m=5), A153611 (m=6), A153632 (m=7), A153895 (m=8), A154020 (m=9), A154171 (m=10), A154192 (m=11), this sequence, A154434 (m=13), A154499 (m=14), A154707 (m=15), A154839 (m=16), A154901 (m=17), A154977 (m=18), A155129 (m=19), A155532 (m=20), A155790 (m=22), A155909 (m=23), A156028 (m=24). %K A154213 nonn,cons %O A154213 0,1 %A A154213 _N. J. A. Sloane_, Oct 30 2009