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 A099077 #22 Feb 16 2025 08:32:54 %S A099077 5,25,2232,4560 %N A099077 Numbers k such that pi(1).pi(2) ... pi(k-1).pi(k) is prime (dot between numbers means concatenation). %C A099077 Number of digits of primes corresponding to the four known terms of this sequence are respectively 4,24,6127,13111. Next term is greater than 10250 and the prime corresponding to the next term has more than 32500 digits. %C A099077 a(5) > 35000. - _Michael S. Branicky_, Nov 25 2024 %H A099077 Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_008.htm">Puzzle 8. Primes by Listing</a>, The Prime Puzzles & Problems connection. %H A099077 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IntegerSequencePrimes.html">Integer Sequence Primes</a> %e A099077 5 is in the sequence because pi(1).pi(2).pi(3).pi(4).pi(5)=1223 is prime. %Y A099077 Cf. A000720, A046035, A099078, A099079, A099080. %K A099077 nonn,base,more %O A099077 1,1 %A A099077 _Farideh Firoozbakht_, Oct 23 2004