Primes p that satisfy s-t < 0 where s = sigma(2*p+1) mod phi(p) and t = sigma(2*p+1) mod p.
A137258
Primes p that satisfy s-t < 0 where s = sigma(2*p+1) mod phi(p) and t = sigma(2*p+1) mod p.
Terms
- a(0) =3a(1) =5a(2) =7a(3) =17a(4) =19a(5) =139a(6) =157a(7) =577a(8) =1201a(9) =27361a(10) =530401a(11) =2513281a(12) =7183201a(13) =407817217
External references
- oeis: A137258