Number of divisors d of n! such that d-1 is prime.

Terms

a(0) =0a(1) =0a(2) =2a(3) =6a(4) =9a(5) =18a(6) =29a(7) =43a(8) =66a(9) =101a(10) =187a(11) =257a(12) =470a(13) =717a(14) =1033a(15) =1293a(16) =2442a(17) =3168a(18) =6011a(19) =7911a(20) =11179a(21) =16888a(22) =32603a(23) =39587a(24) =53063a(25) =79742a(26) =97707a(27) =127679a(28) =246428a(29) =302205