Primes p such that p = 2*phi(sigma((p-1)/2))+1.
A260476
Primes p such that p = 2*phi(sigma((p-1)/2))+1.
Terms
- a(0) =3a(1) =5a(2) =17a(3) =257a(4) =65537a(5) =285121a(6) =1425601a(7) =2380801a(8) =100638721a(9) =8778792961a(10) =184354652161
External references
- oeis: A260476