127031

Properties

Appears in sequences

• Wagstaff numbers: numbers k such that (2^k + 1)/3 is prime.at n=33A000978
• Second convolution of A001045(n+1) (generalized (1,2)-Fibonacci), n>=0, with itself.at n=12A073372
• Indices of prime Jacobsthal numbers.at n=34A107036
• Numbers n such that (2^n+1)/3 is prime, but cannot be written in the form a^2 + 3*b^2.at n=18A216551
• Numbers k such that (2^k + 1)/(2 - (-1)^k) is a prime.at n=38A280083
• Wagstaff numbers that are of the form 4*k + 3.at n=21A361562
• Prime numbersat n=11902