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 A293667 #5 Oct 14 2017 10:46:41 %S A293667 2,3,5,-7,11,-13,17,19,-31,23,29,-47,37,-41,43,53,-83,59,-71,61,67, %T A293667 -127,73,79,-157,89,97,-173,101,-103,107,-109,113,131,-241,137,139, %U A293667 -271,149,-151,163,167,-337,179,181,-349,191,193,-383,197,-199,211,223,-431 %N A293667 First difference of A293666. %C A293667 For any n > 0, |a(n)| is prime. %e A293667 a(10) = A293666(11) - A293666(10) = 30 - 7 = 23. %Y A293667 Cf. A293666. %K A293667 sign %O A293667 1,1 %A A293667 _Rémy Sigrist_, Oct 14 2017