Smallest prime factor of the concatenation of the first n odd primes.

Terms

a(0) =3a(1) =5a(2) =3a(3) =13a(4) =3a(5) =23a(6) =3a(7) =11a(8) =7a(9) =13a(10) =3a(11) =137a(12) =3a(13) =19a(14) =41a(15) =3a(16) =29a(17) =1087a(18) =7a(19) =23a(20) =3a(21) =641a(22) =7a(23) =79a(25) =1254907a(26) =983a(27) =691a(28) =19a(30) =11a(31) =3