Least number k such that (n!+k)/n and (n!-k)/n are both prime.

Terms

a(0) =0a(1) =4a(2) =25a(3) =42a(4) =133a(5) =152a(6) =279a(7) =170a(8) =121a(9) =204a(10) =1079a(11) =938a(12) =5295a(13) =3632a(14) =2771a(15) =1062a(16) =1159a(17) =2260a(18) =7413a(19) =682a(20) =33281a(21) =13704a(22) =9725a(23) =4966a(24) =9099a(25) =24724a(26) =2929a(27) =54690a(28) =20429a(29) =22688