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 A114007 #2 Dec 05 2013 19:57:13 %S A114007 2,3,23,5,7,37,2357,11,211,311,2311 %N A114007 Distinct primes in increasing order interleaved with primes of the form concatenation two or more previous terms say all a(i), a(j) i<j, then all a(i), a(j), a(k) i < j < k etc. Once all the concatenations have exhausted then the least prime that has not occurred earlier. %C A114007 A rearrangement of the primes. %e A114007 23 follows 3. Then the next term is 5 then no concatenation primes occur hence is followed by 7, etc. Each prime occurs only once. %K A114007 base,more,nonn %O A114007 0,1 %A A114007 _Amarnath Murthy_, Nov 12 2005