13466917

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=38A000043
• Bisection of A000043.at n=19A099982
• Mersenne prime indices that are not Gaussian primes.at n=23A112634
• Primes p such that 2^p-1 is prime and congruent to 31 mod 5!.at n=22A145040
• Primes p (A000043) such that 2^p-1 is prime (A000668) and congruent to 271 mod 6!.at n=7A145044
• Base-2 logarithm of A136007(n)+1.at n=25A152961
• Isolated primes p such that 2^p-1 is also a prime number.at n=24A161676
• Primes p such that 2*p-1 and 2^p-1 are both primes.at n=10A172461
• Odd Mersenne exponents.at n=37A174265
• Numbers k such that exactly one of 2^k - 1 and 2^k + 1 is a prime.at n=42A174269
• Prime numbers n such that 2^n-1 is prime and can be written in the form a^2+7*b^2.at n=19A216518
• Numbers k such that 3*k-4 and 2^k-1 are prime.at n=17A247147
• Numbers m such that 2^m + (-1)^m is prime.at n=42A285929
• Lower of two consecutive Mersenne prime exponents with record first difference.at n=19A298943
• 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=19A354167
• Exponents of Mersenne primes that are emirps.at n=7A377465
• Prime numbersat n=877615