The least prime factor of the numerator of Bernoulli(2*n), or 1 if the numerator is 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =5a(6) =691a(7) =7a(8) =3617a(9) =43867a(10) =283a(11) =11a(12) =103a(13) =13a(14) =7a(15) =5a(16) =37a(17) =17a(19) =19a(20) =137616929a(22) =11a(23) =23a(24) =653a(25) =5a(26) =13a(27) =39409a(28) =7a(29) =29a(30) =2003a(31) =31