Numbers k such that k! + k!! + 1 is prime, where k!! denotes double factorial (A006882).
A116896
Numbers k such that k! + k!! + 1 is prime, where k!! denotes double factorial (A006882).
Terms
- a(0) =0a(1) =1a(2) =2a(3) =6a(4) =42a(5) =604a(6) =1976a(7) =5126a(8) =14124
External references
- oeis: A116896