Least odd prime divisor of p(n)*p(n-1) + 1, or 1 if p(n)*p(n-1) + 1 is a power of 2.

Terms

a(0) =3a(1) =7a(2) =1a(3) =3a(4) =3a(5) =3a(6) =3a(7) =3a(8) =3a(9) =167a(10) =3a(11) =7a(12) =3a(13) =3a(14) =3a(15) =7a(16) =17a(17) =3a(18) =7a(19) =3a(20) =3a(21) =7a(22) =3a(23) =1847a(24) =3a(25) =3a(26) =3a(27) =3a(28) =3a(29) =3