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 A155680 #10 Aug 17 2023 16:53:17 %S A155680 1,1,8,6,9,7,1,7,5,3,9,9,0,6,9,3,6,7,5,6,6,3,1,0,5,9,5,3,7,1,0,6,6,8, %T A155680 8,8,4,1,1,5,2,8,2,7,0,3,4,6,8,7,6,5,9,0,7,0,0,0,8,0,8,0,2,0,9,5,4,3, %U A155680 3,6,8,8,2,6,5,4,8,4,7,2,7,9,8,6,2,1,2,4 %N A155680 Decimal expansion of log_13 (21). %H A155680 Vincenzo Librandi, <a href="/A155680/b155680.txt">Table of n, a(n) for n = 1..1000</a> %H A155680 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %e A155680 1.1869717539906936756631059537106688841152827034687659070008... %t A155680 RealDigits[Log[13, 21], 10, 100][[1]] (* _Vincenzo Librandi_, Sep 02 2013 *) %Y A155680 Cf. decimal expansion of log_13(m): A152779 (m=2), A153016 (m=3), A153106 (m=4), A153313 (m=5), A153603 (m=6), A153623 (m=7), A153855 (m=8), A154013 (m=9), A154163 (m=10), A154184 (m=11), A154205 (m=12), A154481 (m=14), A154583 (m=15), A154803 (m=16), A154885 (m=17), A154970 (m=18), A155065 (m=19), A155525 (m=20), this sequence, A155759 (m=22), A155837 (m=23), A155983 (m=24). %K A155680 nonn,cons %O A155680 1,3 %A A155680 _N. J. A. Sloane_, Oct 30 2009