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

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =5a(6) =7a(7) =1a(8) =5a(9) =13a(10) =7a(11) =17a(12) =19a(13) =5a(14) =11a(15) =5a(16) =7a(17) =29a(18) =1a(19) =17a(20) =5a(21) =19a(22) =5a(23) =43a(24) =47a(25) =7a(26) =5a(27) =13a(28) =53a(29) =5