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 A104015 #14 Aug 27 2018 22:32:44 %S A104015 1,0,0,1,0,0,1,1,1,1,0,0,0,1,0,0,0,1,1,0,0,1,1,1,1,1,1,0,0,0,1,1,0,1, %T A104015 1,1,1,1,0,1,1,0,1,1,0,0,0,0,1,1,0,0,0,1,1,1,1,0,1,0,0,1,0,0,1,1,0,1, %U A104015 0,0,0,1,1,0,1,1,1,1,1,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0 %N A104015 Binary expansion of Euler's constant (or Euler-Mascheroni constant) gamma (A001620). %H A104015 G. C. Greubel, <a href="/A104015/b104015.txt">Table of n, a(n) for n = 0..10000</a> %e A104015 .1001001111000100011001111110... %t A104015 RealDigits[EulerGamma,2,120][[1]] (* _Harvey P. Dale_, May 25 2018 *) %o A104015 (PARI) binary(Euler)[2] \\ _Michel Marcus_, Dec 14 2017 %Y A104015 Cf. A001620. %K A104015 base,cons,nonn %O A104015 0,1 %A A104015 Bryan Jacobs (bryanjj(AT)gmail.com), Mar 31 2005