54410972897
domain: N
Appears in sequences
- Largest prime factor of 16^n + 1.at n=14A002590
- For p = prime(n), a(n) is the largest prime q such that pq is a base-2 pseudoprime; that is, 2^(pq-1) = 1 mod pq; a(n) is 0 if no such prime exists.at n=28A086019
- Largest prime factor of 4^n + 1.at n=28A274903
- a(n) = largest prime q such that q | 2^p - 2 and p - 1 | q - 1, where p = prime(n).at n=29A287945
- a(n) is the largest prime factor of 2^(prime(n) - 1) - 1.at n=28A358699