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 A036340 #12 Oct 10 2019 03:59:45 %S A036340 467,941,959941,3396199,4858943,5696101,6475643,7566133,7584253, %T A036340 7592261,9305281,9463877,11430491,13442243,14374837,15941473,17414497, %U A036340 17691997,19584223,21421849,22310159,22808459,27601163,29198881 %N A036340 Concatenation of prime p and nextprime(p) is prime -> cycles of 3 steps possible. %C A036340 Terms from 3396199 up to 17691997 found by Jo Yeong Uk (hyukjo(AT)sigma.chungnam.ac.kr). %H A036340 Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_029.htm">Puzzle 29. Pi = P i-1&nxtprm(P i-1), Pi = prime for i => 1</a>, The Prime Puzzles & Problems Connection. %Y A036340 Cf. A030459, A034593, A036339, A036341. %K A036340 nonn,base %O A036340 0,1 %A A036340 _Patrick De Geest_, Dec 15 1998