Primes obtained as a concatenation p,q,p where p and q are successive primes and p<q.

Terms

a(0) =353a(1) =131713a(2) =171917a(3) =192319a(4) =293129a(5) =374137a(6) =434743a(7) =596159a(8) =677167a(9) =139149139a(10) =163167163a(11) =179181179a(12) =223227223a(13) =229233229a(14) =269271269a(15) =281283281a(16) =347349347a(17) =379383379a(18) =547557547a(19) =683691683a(20) =761769761a(21) =857859857a(22) =863877863a(23) =102110311021a(24) =103910491039a(25) =108710911087a(26) =109110931091a(27) =109310971093