Smallest prime == 1 mod L, where L = LCM of 1 to n.

Terms

a(0) =2a(1) =3a(2) =7a(3) =13a(4) =61a(5) =61a(6) =421a(7) =2521a(8) =2521a(9) =2521a(10) =55441a(11) =55441a(12) =4324321a(13) =4324321a(14) =4324321a(15) =4324321a(16) =85765681a(17) =85765681a(18) =232792561a(19) =232792561a(20) =232792561a(21) =232792561a(22) =10708457761a(23) =10708457761a(24) =26771144401a(25) =26771144401a(26) =401567166001a(27) =401567166001