A024767 Every prefix prime in base 7 (written in base 7).
2, 3, 5, 23, 25, 32, 52, 56, 254, 256, 322, 326, 524, 566, 2564, 3262, 5246, 5662, 25642
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.