Smallest prime factor of A001008(n), numerator of n-th harmonic number; a(1) = 1.

Terms

a(0) =1a(1) =3a(2) =11a(3) =5a(4) =137a(5) =7a(6) =3a(7) =761a(8) =7129a(9) =11a(10) =97a(11) =13a(12) =29a(13) =1049a(14) =29a(15) =17a(16) =37a(17) =19a(18) =37a(19) =5a(20) =18858053a(21) =3a(22) =761a(23) =5a(24) =109a(25) =34395742267a(26) =521a(27) =29a(28) =43a(29) =31