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 A086208 #4 Jul 25 2015 14:03:52 %S A086208 3,7,13,43,73 %N A086208 Prime numbers p with the property that the sequence p-1*2, p-2*3, p-3*4, p-4*5, ..., consists only of primes and a final 1. %C A086208 Related to the fact that the list 5, 8, 13, 29, 53, 173, 293 gives the only positive discriminants of class number 1 of the form j^2+1. %C A086208 If we allow the first number that we subtract to be greater than 2, the next sequence after 73, 71, 67, 61,... is 2003, 1831, 1657, 1481, 1303, 1123, 941, 757, 571, 383, 193, 1: start with 2003 and subtract 172,174,176, etc., which is an amusing property of 2003. %e A086208 For example 73 71 67 61 53 43 31 17 1. If the GRH is true this is the last example. %K A086208 nonn,fini,full %O A086208 0,1 %A A086208 Maurice Mischler (maurice.mischler(AT)ima.unil.ch), Aug 27 2003 %E A086208 Definition corrected by _Harvey P. Dale_, Jul 25 2015