Primes which are the concatenation of a Sophie Germain prime p and 2p+1.

Terms

a(0) =37a(1) =1123a(2) =2347a(3) =113227a(4) =173347a(5) =281563a(6) =359719a(7) =431863a(8) =491983a(9) =5091019a(10) =7191439a(11) =11032207a(12) =12292459a(13) =15593119a(14) =18893779a(15) =19313863a(16) =20394079a(17) =23934787a(18) =24594919a(19) =34136827a(20) =35397079a(21) =37617523a(22) =39117823a(23) =43918783a(24) =47939587