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 A117853 #17 Jul 20 2021 01:33:34 %S A117853 3,1,5,4,1,6,4,7,5,6,1,8,8,4,6,0,8,0,9,3,6,3,0,3,0,2,8,6,6,4,5,4,5,1, %T A117853 7,0,1,2,6,5,1,9,6,5,6,2,6,2,3,2,3,8,7,0,3,1,6,3,2,3,7,1,0,7,9,5,1,3, %U A117853 5,3,8,7,4,4,9,0,0,6,9,3,4,6,2,0,9,4,3,8,6,2,9,4,7,5,1,7,0,2,9,6,6,3,6,2,3 %N A117853 Decimal expansion of 2^30402457-1, the 43th Mersenne prime A000668(43). %C A117853 The decimal expansion of 2^30402457-1. This is the 43rd known Mersenne prime, found at Dec 15, 2005 by the GIMPS project / Curtis Cooper and Steven Boone. The number has 9152052 digits; as a string, it occupies 9.24 MB. %H A117853 Landon Curt Knoll, <a href="http://lcn2.github.io/mersenne-english-name/m30402457/prime-c.html">2^30402457-1 is prime</a>. %H A117853 George Woltman, GIMPS <a href="http://www.mersenne.org/">GIMPS Home Page</a>. %e A117853 A000668(43) = 3154164756188460809363030286645451701265196562623...7411652943871. %t A117853 RealDigits[10^N[30402457Log[10, 2] - 9152051, 111]][[1]] %Y A117853 Cf. A000043 (Mersenne exponents), A000668. %K A117853 cons,fini,nonn %O A117853 9152052,1 %A A117853 _Jacob Vecht_, May 02 2006 %E A117853 Edited by _Georg Fischer_, Jul 19 2021