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

Terms

a(0) =37a(1) =1123a(2) =1327a(3) =2347a(4) =3163a(5) =59119a(6) =71143a(7) =79159a(8) =101203a(9) =113227a(10) =151303a(11) =163327a(12) =173347a(13) =193387a(14) =199399a(15) =229459a(16) =269539a(17) =281563a(18) =331663a(19) =359719a(20) =383767a(21) =431863a(22) =491983a(23) =5091019a(24) =5691139a(25) =6611323a(26) =7091419a(27) =7191439a(28) =8291659a(29) =8391679