Prime p such that 2^p + 21 is also prime.
A175235
Prime p such that 2^p + 21 is also prime.
Terms
- a(0) =3a(1) =5a(2) =7a(3) =11a(4) =19a(5) =61a(6) =163a(7) =911a(8) =997a(9) =16657a(10) =36551
External references
- oeis: A175235
A175235
Prime p such that 2^p + 21 is also prime.