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.
?(Divisible[DivisorSigma[1, k], # * DivisorSigma[1, #]] &)] != n, k++]; k]; Array[a, 25] (* _Amiram Eldar has authored 0 sequences.