a(1) = 1; for n>1, a(n) = smallest integer > a(n-1) such that a(n)*a(i)+1 is prime for all 1 <= i <= n-1.
A034881
a(1) = 1; for n>1, a(n) = smallest integer > a(n-1) such that a(n)*a(i)+1 is prime for all 1 <= i <= n-1.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =30a(5) =270a(6) =606a(7) =123120a(8) =888456a(9) =23070450a(10) =238550160a(11) =8282903640a(12) =72789145650
External references
- oeis: A034881