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 A089317 #12 May 08 2021 22:59:52 %S A089317 151,373,95959,9515959,159595151,159595951,15151595951,15951595151, %T A089317 95951515159,1515159515951,1515959515951,1515959595151,1595159515151, %U A089317 1595159595151,9515151515159,9515159515159,9515159595959,9595159515959 %N A089317 Prime worms [successive digit differences with absolute value of 4]. %D A089317 Carlos Rivera's primepuzzles.net, Puzzle 246 %H A089317 Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_246.htm">Puzzle 246. The worm</a> %F A089317 Select prime numbers having the same first and last digits; if the uniform absolute value of successive digit differences is 4, add to sequence. %e A089317 a(1)=373; first and last digits are 3; abs(3-7)=4; abs(7-3)=4; the worm is 3. %Y A089317 This is a subsequence of A048401. Cf. A089291, A089315-A089316, A048398-A048405. %K A089317 easy,nonn,base %O A089317 0,1 %A A089317 _Enoch Haga_, Dec 25 2003 %E A089317 More terms from _David Wasserman_, Sep 09 2005