A367195 Primes p such that (2^(p-1)*(p+1) - 1) / p is prime.

3, 5, 7, 11, 19, 29, 41, 61, 137, 181, 293, 11171

Offset: 1

Author

M. Farrokhi D. G., Nov 09 2023

Keywords

• nonn
• more

Comments

2^(p-1)*(p+1) - 1 is the p-th term of the Cunningham chain p = n_1, n_2, ..., where n_{i+1} = 2*n_i+1 for i >= 1.

Extensions

a(12) from Michael S. Branicky, Nov 09 2023