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 A248933 #20 Sep 08 2022 08:46:10 %S A248933 4,4,6,0,8,7,5,5,7,1,8,3,7,5,8,4,2,9,5,7,1,1,5,1,7,0,6,4,0,2,1,0,1,8, %T A248933 0,9,8,8,6,2,0,8,6,3,2,4,1,2,8,5,9,9,0,1,1,1,1,9,9,1,2,1,9,9,6,3,4,0, %U A248933 4,6,8,5,7,9,2,8,2,0,4,7,3,3,6,9,1,1,2,5,4,5,2,6,9,0,0,3,9,8,9,0,2,6,1,5,3 %N A248933 Decimal expansion of 2^2281 - 1, the 17th Mersenne prime A000668(17). %C A248933 The 13th through the 17th Mersenne primes were found in 1952 by Raphael M. Robinson, using SWAC. %C A248933 The digits of this prime were published on page 167 of Nordisk Mathematisk Tidskrift 2 (1954). %H A248933 Arkadiusz Wesolowski, <a href="/A248933/b248933.txt">Table of n, a(n) for n = 687..1373</a> %H A248933 D. H. Lehmer, <a href="http://www.ams.org/journals/mcom/1953-07-041/S0025-5718-53-99371-5/S0025-5718-53-99371-5.pdf">Two New Mersenne Primes</a>, Mathematics of Computation, vol. 7, No. 41 (1952), p. 72. %H A248933 Wikipedia, <a href="http://en.wikipedia.org/wiki/Mersenne_prime">Mersenne prime</a> %F A248933 Equals 2^A000043(17) - 1. %e A248933 44608755718375842957115170640210180988620863241285990111199121996340468... %t A248933 RealDigits[2^2281 - 1, 10, 100][[1]] (* _G. C. Greubel_, Oct 03 2017 *) %o A248933 (Magma) Reverse(Intseq(2^2281-1)); %o A248933 (PARI) eval(Vec(Str(2^2281-1))) %Y A248933 Cf. A169684 = A000668(11), A169681 = A000668(12), A169685 = A000668(13), A204063 = A000668(14), A248931 = A000668(15), A248932 = A000668(16), A248934 = A000668(18), A248935 = A000668(19), A248936 = A000668(20). %K A248933 nonn,cons,easy,fini,full %O A248933 687,1 %A A248933 _Arkadiusz Wesolowski_, Oct 17 2014