Double Mersenne number

In mathematics, a double Mersenne number is a Mersenne number of the form

Double Mersenne primes
No. of known terms4
Conjectured no. of terms4
First terms7, 127, 2147483647
Largest known term170141183460469231731687303715884105727
OEIS index
  • A077586
  • a(n) = 2^(2^prime(n) − 1) − 1

where p is prime.

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