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 A155687 #10 Aug 17 2023 16:34:43 %S A155687 1,0,1,6,2,8,6,5,5,6,9,1,3,0,2,8,0,5,4,5,6,7,2,4,0,2,5,6,2,1,6,9,3,5, %T A155687 9,6,3,3,0,4,0,2,6,9,7,2,5,7,0,0,1,0,8,2,1,5,0,8,4,1,2,7,3,6,8,4,8,3, %U A155687 9,0,7,4,0,8,7,1,0,9,8,8,7,6,4,5,1,2,1,0,6,3,8,5,2,9,4,6,3,0,2 %N A155687 Decimal expansion of log_20 (21). %H A155687 Vincenzo Librandi, <a href="/A155687/b155687.txt">Table of n, a(n) for n = 1..1000</a> %H A155687 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %e A155687 1.0162865569130280545672402562169359633040269725700108215084... %t A155687 RealDigits[Log[20, 21], 10, 100][[1]] (* _Vincenzo Librandi_, Sep 05 2013 *) %Y A155687 Cf. decimal expansion of log_20(m): A152821 (m=2), A153035 (m=3), A153124 (m=4), A153454 (m=5), A153610 (m=6), A153630 (m=7), A153872 (m=8), A154019 (m=9), A154170 (m=10), A154191 (m=11), A154212 (m=12), A154433 (m=13), A154492 (m=14), A154705 (m=15), A154838 (m=16), A154900 (m=17), A154976 (m=18), A155115 (m=19), this sequence, A155789 (m=22), A155907 (m=23), A156015 (m=24). %Y A155687 Inverse of A155532. %K A155687 nonn,cons %O A155687 1,4 %A A155687 _N. J. A. Sloane_, Oct 30 2009