A286678 Smallest prime of the form (1 + k)^(2^n) + k.
5, 17, 257, 65537, 795866110996400884391941, 3402823669209384634633746074317682114560000000000000000000000000000000000000000000000000000000000000039
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.