Smallest prime divisor of n-th partial concatenation is prime(n).

Terms

a(0) =2a(1) =1a(2) =5a(3) =11a(4) =27a(5) =81a(6) =153a(7) =91a(8) =71a(9) =183a(10) =27a(11) =67a(12) =147a(13) =219a(14) =347a(15) =99a(16) =831a(17) =109a(18) =627a(19) =329a(20) =1053a(21) =363a(22) =603a(23) =357a(24) =349a(25) =219a(26) =981a(27) =129a(28) =737a(29) =369