Primes formed by the concatenation p,q,p where p and q are successive primes and p>q.

Terms

a(0) =757a(1) =131113a(2) =171317a(3) =231923a(4) =312931a(5) =474347a(6) =978997a(7) =10197101a(8) =107103107a(9) =127113127a(10) =139137139a(11) =151149151a(12) =167163167a(13) =367359367a(14) =421419421a(15) =433431433a(16) =461457461a(17) =617613617a(18) =643641643a(19) =701691701a(20) =863859863a(21) =911907911a(22) =991983991a(23) =102110191021a(24) =103110211031a(25) =103310311033a(26) =104910391049