137438691329
domain: N
Appears in sequences
- "Right perfect numbers": primes of the form 1 + a perfect number.at n=3A061644
- Primes p such that cototient(totient(p)) = A070556(p) is a power of 2.at n=27A070806
- Primes of the form 1 + multiple perfect number.at n=10A093034
- a(n) = 2^(n-1)*(2^n - 1) + 1.at n=19A134169
- Nearest-neighbors of perfect numbers.at n=13A135606
- Perfect numbers plus 1.at n=6A135629
- Primes of the form q*2^h + 1, where q is a Mersenne prime.at n=22A336117