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 A199428 #18 Apr 03 2023 10:36:12 %S A199428 40144044691,58058453543,89797181359,185113489357,213022025663, %T A199428 222498988079,365115312521,397195264507,507086259359,537598896647, %U A199428 576872778883,671770400281,710587610861,719174481061,815380174991,840202011349,855194972407,869287849361,891600776149 %N A199428 Extreme weakly prime numbers. %C A199428 Primes that become composite if any digit is removed, changed, or inserted anywhere. First & smallest term found by Jens K. Andersen in 2008; five more by Giovanni Resta in Nov. 2011. Expected infinite of them. These primes emerge in relation to the prime-version of classical Doublets puzzle by Lewis Carrol. Correspond to the "aloof" words as named by Donald Knuth. %H A199428 Giovanni Resta, <a href="/A199428/b199428.txt">Table of n, a(n) for n = 1..50</a> %H A199428 G. L. Honaker, Jr. and C. K. Caldwell, <a href="https://t5k.org/curios/page.php/40144044691.html">Prime Curios! 40144044691</a> %H A199428 C. Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_612.htm">The prime puzzles & problems connection, puzzle 612</a> %H A199428 Wikipedia, <a href="http://en.wikipedia.org/wiki/Word_ladder">Word ladder</a> %Y A199428 Cf. A050249. %K A199428 nonn,base %O A199428 1,1 %A A199428 _Carlos Rivera_, Nov 06 2011 %E A199428 More terms from _Giovanni Resta_, Aug 15 2019