A034307 Numbers n such that there are no oblong (promic) palindromes of length n.
2, 5, 9, 12, 18, 20, 30, 34
Offset: 1
Links
- P. De Geest, Palindromic pronic numbers of the form n(n+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.