a(1) = 1 ; for n > 1, a(n) is the smallest number such that a(n)^2 + 1 contains n distinct prime divisors dividing a(n+1)^2 + 1.
A193164
a(1) = 1 ; for n > 1, a(n) is the smallest number such that a(n)^2 + 1 contains n distinct prime divisors dividing a(n+1)^2 + 1.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =47a(4) =463a(5) =25683a(6) =4187997
External references
- oeis: A193164