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.
2) - 2 * popcount(prime(n)_2) + 2, n > 1. - _Sean A. Irvine's wiki page.
2) - 2 * popcount(prime(n)_2) + 2, n > 1. - _Sean A. Irvine has authored 0 sequences.