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 A084319 #14 Apr 08 2021 03:20:35 %S A084319 91,713,2331,3737,37101,383149,1329473,10912197,328312853,1129846623, %T A084319 3735159117,31245053039,173977184859,3293176308321,319269241788861, %U A084319 371325123869195203,1278647733810375857,1665622037676698019,31742715741254857303,56627509560552923867 %N A084319 Orbit of 91 under function described in A084317. %C A084319 This sequence takes 64 steps to reach a prime (which implies A343156(91)=64). - _N. J. A. Sloane_, Apr 07 2021 %D A084319 Eric Angelini, W. Edwin Clark, Hans Havermann, Frank Stevenson, Allan C. Wechsler, and others, Postings to Math Fun mailing list, April 2021. %H A084319 W. Edwin Clark, <a href="/A084319/b084319.txt">Table of n, a(n) for n = 0..63</a> [The trajectory to the first prime.] %e A084319 a(29) = 19797186041838357425713338412621, the 29th iterate. %t A084319 NestList[FromDigits@ Flatten@ IntegerDigits@ Map[First, FactorInteger@ #] &, 91, 17] (* _Michael De Vlieger_, Mar 25 2017 *) %Y A084319 Cf. A084317, A056938, A084318, A343156. %K A084319 base,nonn %O A084319 0,1 %A A084319 _Labos Elemer_, Jun 16 2003 %E A084319 Example corrected by _Rémy Sigrist_, Apr 07 2021