Smallest prime factor of the reverse concatenation of the first n odd numbers.

Terms

a(0) =31a(1) =3a(2) =17a(3) =7a(4) =3a(5) =1579a(6) =17a(7) =3a(8) =2677a(9) =131a(10) =3a(11) =54049423a(12) =47a(13) =3a(14) =487a(15) =25541a(16) =3a(17) =7a(18) =211a(19) =3a(20) =31a(21) =622639a(22) =3a(23) =498508631a(24) =7a(25) =3a(26) =1259a(27) =193a(28) =3a(29) =7669