a(0)=1; for n>=1, a(n) = the largest prime dividing n*a(n-1) + 1.

Terms

a(0) =1a(1) =2a(2) =5a(3) =2a(4) =3a(5) =2a(6) =13a(7) =23a(8) =37a(9) =167a(10) =557a(11) =383a(12) =4597a(13) =29881a(14) =167a(15) =179a(16) =191a(17) =29a(18) =523a(19) =4969a(20) =211a(21) =277a(22) =53a(23) =61a(24) =293a(25) =37a(26) =107a(27) =17a(28) =53a(29) =769