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 A121045 #4 Apr 02 2025 19:01:27 %S A121045 3,11,101,1013,10141,100153,1000193,10000763,100000673,1000000933, %T A121045 10000002713,100000005041,1000000010489,10000000003243 %N A121045 Least cluster prime greater than 10^n. %C A121045 These numbers are useful for generating intermediate cluster primes because the best algorithm for generating cluster primes requires starting with a known cluster prime. %H A121045 Wikipedia, <a href="https://en.wikipedia.org/wiki/Cluster_prime">Cluster prime</a>. %Y A121045 Cf. A038134 (cluster primes), A039506 (number of cluster primes < 10^n), A121044. %K A121045 nonn %O A121045 0,1 %A A121045 _T. D. Noe_, Jul 21 2006