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

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =5a(5) =3a(6) =1a(7) =3a(8) =11a(9) =7a(10) =3a(11) =3a(12) =5a(13) =3a(14) =23a(15) =13a(16) =29a(17) =3a(18) =3a(19) =5a(20) =3a(21) =3a(22) =41a(23) =11a(24) =3a(25) =5a(26) =3a(27) =53a(28) =3a(29) =7