Primes which are the average of any two (not necessarily distinct) Mersenne primes (A000668).

A171254

Primes which are the average of any two (not necessarily distinct) Mersenne primes (A000668).

Terms

    a(0) =3a(1) =5a(2) =7a(3) =17a(4) =19a(5) =31a(6) =67a(7) =79a(8) =127a(9) =4099a(10) =4111a(11) =4159a(12) =8191a(13) =65537a(14) =65539a(15) =65551a(16) =65599a(17) =131071a(18) =262147a(19) =266239a(20) =524287a(21) =1073741827a(22) =1073741839a(23) =1073807359a(24) =2147483647

External references