Least number k >= 0 such that (n!-k)/n is prime.

Terms

a(0) =0a(1) =4a(2) =5a(3) =42a(4) =7a(5) =8a(6) =279a(7) =130a(8) =121a(9) =156a(10) =13a(11) =322a(12) =15a(13) =752a(14) =901a(15) =1062a(16) =779a(17) =2020a(18) =651a(19) =682a(20) =1679a(21) =2136a(22) =1825a(23) =3874a(24) =999a(25) =1204a(26) =2929a(27) =930a(28) =31a(29) =1952