Numbers n such that A099953(n) = Sum_{i=1..n-1} (2i-1)!! is prime.
A284123
Numbers n such that A099953(n) = Sum_{i=1..n-1} (2i-1)!! is prime.
Terms
- a(0) =4a(1) =6a(2) =14a(3) =402a(4) =472a(5) =494a(6) =7926a(7) =13060
External references
- oeis: A284123