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 A089315 #10 May 08 2021 23:53:21 %S A089315 14741,74747,1414741,1474141,14141414141,14141414741,14141474741, %T A089315 14147414741,14147474141,74141414147,1474741414141,7474141474747, %U A089315 7474741414747,14141474141414141,14147414747474741,14147474147474741 %N A089315 Prime worms [successive digit differences with absolute value of 3]. %C A089315 One of a family of prime worms differing according to the uniform absolute value of successive digit pairs. Sequence checked to 10^9. %C A089315 This is a subset of A048400. Cf. A089291, A089316-A089317, A048398-A048405. %D A089315 Carlos Rivera's primepuzzles.net, Puzzle 246. %H A089315 Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_246.htm">Puzzle 246. The worm </a> %F A089315 Select prime numbers having the same first and last digits; if the uniform absolute value of successive digit differences is 3, add to sequence. %e A089315 a(1)=74747 because the number is prime, has identical first and last digits and abs(7-4)=3; abs(4-7)=3; abs(7-4)=3 and abs(4-7)=3. In this number, the worm is 7. %K A089315 easy,nonn,base %O A089315 0,1 %A A089315 _Enoch Haga_, Dec 25 2003 %E A089315 More terms from _David Wasserman_, Sep 09 2005