Least odd prime divisor of prime(n)+3, or 1 if prime(n)+3 is a power of 2.

Terms

a(0) =5a(1) =3a(2) =1a(3) =5a(4) =7a(5) =1a(6) =5a(7) =11a(8) =13a(9) =1a(10) =17a(11) =5a(12) =11a(13) =23a(14) =5a(15) =7a(16) =31a(17) =1a(18) =5a(19) =37a(20) =19a(21) =41a(22) =43a(23) =23a(24) =5a(25) =13a(26) =53a(27) =5a(28) =7a(29) =29