A067387 Duplicate of A050922.
3, 5, 17, 257, 65537, 641, 6700417, 274177, 67280421310721, 59649589127497217
Offset: 1
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.