Smallest prime factor of A104357(n) = A104350(n) - 1.

Terms

a(0) =1a(1) =5a(2) =11a(3) =59a(4) =179a(5) =1259a(6) =11a(7) =7559a(8) =37799a(9) =415799a(10) =71a(11) =227a(12) =5981a(13) =9067a(14) =1135133999a(15) =11717a(16) =61a(17) =79a(19) =97a(20) =1543a(21) =31a(23) =8937119a(24) =181a(25) =401a(26) =124759a(27) =443851a(28) =31a(29) =2141a(30) =3082663a(31) =8191