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 A233783 #14 Aug 10 2015 17:54:44 %S A233783 2,23,251,347,5023,50227,64037,3924211,4952767,43275737,586635689, %T A233783 592856489,62527264517 %N A233783 The smallest prime that produces a set of n primes such that every prime after the first one is equal to the previous minus the product of its nonzero digits. %C A233783 a(14) > 6.8*10^11. - _Giovanni Resta_, Dec 16 2013 %e A233783 Example: for n = 3, initial prime is 251, because 251 -> 251 - 2*5*1 = 241 -> 241 - 2*4*1 -> 233. %Y A233783 Cf. A063543, A233692. %K A233783 nonn,base,hard %O A233783 1,1 %A A233783 _Carlos Rivera_, Dec 15 2013 %E A233783 a(11)-a(13) from _Giovanni Resta_, Dec 16 2013