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 A275980 #11 Sep 08 2022 08:46:17 %S A275980 2,8,1,4,1,1,2,0,1,3,6,9,7,3,7,3,1,3,3,3,9,3,1,5,2,9,7,5,8,4,2,5,8,4, %T A275980 1,9,1,8,1,8,6,6,2,3,8,2,0,1,3,6,0,0,7,8,7,8,9,2,4,1,9,3,4,9,3,4,5,5, %U A275980 1,5,1,7,6,6,8,2,2,7,6,3,1,3,8,1,0,7,1,5,0,9,4,7,4,5,6,3,3,2,5,7,0,7,4,1,9 %N A275980 Decimal expansion of 2^11213 - 1, the 23rd Mersenne prime A000668(23). %H A275980 Arkadiusz Wesolowski, <a href="/A275980/b275980.txt">Table of n, a(n) for n = 3376..6751</a> %H A275980 Wikipedia, <a href="http://en.wikipedia.org/wiki/Mersenne_prime">Mersenne prime</a> %F A275980 2^A000043(23) - 1. %e A275980 28141120136973731333931529758425841918186623820136007878924193493455151... %t A275980 First@RealDigits@N[2^11213 - 1, 100] (* _G. C. Greubel_, Aug 15 2016 *) %o A275980 (Magma) Reverse(Intseq(2^11213-1))[1..105]; %o A275980 (PARI) eval(Vec(Str(2^11213-1)))[1..105] %Y A275980 Cf. A169684 = A000668(11), A169681 = A000668(12), A169685 = A000668(13), A204063 = A000668(14), A248931 = A000668(15), A248932 = A000688(16), A248933 = A000668(17), A248934 = A000668(18), A248935 = A000668(19), A248936 = A000668(20), A275977 = A000668(21), A275979 = A000668(22), A275981 = A000668(24), A275982 = A000668(25), A275983 = A000668(26), A275984 = A000668(27). %K A275980 nonn,cons,easy,fini,full %O A275980 3376,1 %A A275980 _Arkadiusz Wesolowski_, Aug 15 2016