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 A343157 #41 Dec 12 2022 08:31:24 %S A343157 407,1137,3379,31109,132393,344131,1731653,71143523,115771019, %T A343157 7133141039,18152375353,723112747673,1938058565667,372411163329269, %U A343157 646991575604859,3500960117162747,19920988418382133,479222853318661919,3877130279948783893,71942196909541476259,7170749184914732550379 %N A343157 Trajectory of 407 under the map x -> A084317(x). %C A343157 It is not known if any a(n) is a prime (see discussion in A343156). - _N. J. A. Sloane_, Apr 07 2021 %D A343157 Eric Angelini, W. Edwin Clark, Hans Havermann, Frank Stevenson, Allan C. Wechsler, and others, Postings to Math Fun mailing list, April 2021. %H A343157 Jinyuan Wang, <a href="/A343157/b343157.txt">Table of n, a(n) for n = 0..91</a> (terms 0..84 from Hans Havermann) %Y A343157 Cf. A056938, A084317, A343156. %K A343157 nonn,base %O A343157 0,1 %A A343157 _Hans Havermann_, Apr 07 2021