If p | n, then p+1 | n+1 for composite n.

Terms

a(0) =8a(1) =27a(2) =32a(3) =63a(4) =125a(5) =128a(6) =243a(7) =275a(8) =343a(9) =399a(10) =512a(11) =567a(12) =575a(13) =935a(14) =1127a(15) =1331a(16) =1539a(17) =2015a(18) =2048a(19) =2187a(20) =2197a(21) =2303a(22) =2783a(23) =2915a(24) =3087a(25) =3125a(26) =4563a(27) =4913a(28) =4991a(29) =5103