Primes p such that sigma(p-1) - phi(p-1) = (3p-5)/2.

A270778

Primes p such that sigma(p-1) - phi(p-1) = (3p-5)/2.

Terms

    a(0) =3a(1) =5a(2) =11a(3) =17a(4) =257a(5) =65537a(6) =119831

External references