A216564 Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + 2*b^2.
7, 19, 31, 79, 5851, 8467, 13963, 574219
Offset: 1
Keywords
Links
- Blair Kelly, Factorizations of Fibonacci and Lucas numbers
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.