2976221

Properties

Appears in sequences

• Mersenne exponents: primes p such that 2^p - 1 is prime. Then 2^p - 1 is called a Mersenne prime.at n=35A000043
• Bisection of A000043.at n=17A099983
• Mersenne prime indices that are not Gaussian primes.at n=20A112634
• Primes p such that 2^p-1 is prime and congruent to 31 mod 5!.at n=19A145040
• Primes p (A000043) such that 2^p-1 is prime (A000668) and congruent to 31 mod 6!.at n=12A145041
• Isolated primes p such that 2^p-1 is also a prime number.at n=21A161676
• Odd Mersenne exponents.at n=34A174265
• Numbers k such that exactly one of 2^k - 1 and 2^k + 1 is a prime.at n=39A174269
• Prime numbers n such that 2^n-1 is a prime that cannot be written in the form a^2+7*b^2.at n=16A216519
• Numbers m such that 2^m + (-1)^m is prime.at n=39A285929
• Numbers m such that q = 2^m - 1 and r = m^2 + m + 1 are both primes.at n=7A308316
• Let M_p = 2^p-1 be a Mersenne prime, where p is an odd prime. Sequence lists p such that b_{p-2} == 2^((p+1)/2) mod M_p, where {b_k} is defined in the Comments.at n=16A354167
• Prime numbersat n=215208