Numbers n such that (n!/n#)^2 + 1 is prime, where n# = primorial numbers (A034386).
A108948
Numbers n such that (n!/n#)^2 + 1 is prime, where n# = primorial numbers (A034386).
Terms
- a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =12a(8) =13a(9) =22a(10) =23a(11) =39a(12) =50a(13) =54a(14) =60a(15) =61a(16) =69a(17) =182a(18) =620a(19) =767a(20) =1308a(21) =5129
External references
- oeis: A108948