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.
+4-1 } sieve_prime_cluster(1,5e8,4) # _Dana Jacobsen's wiki page.
+4-1 } sieve_prime_cluster(1,5e8,4) # _Dana Jacobsen has authored 0 sequences.