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.
} = 1 for @{ramanujan_primes(1e7)}; say for grep { !exists $r{$'s wiki page.
} = 1 for @{ramanujan_primes(1e7)}; say for grep { !exists $r{$ has authored 0 sequences.