Previous prime concatenated with this prime p is a prime.

Terms

a(0) =3a(1) =37a(2) =89a(3) =157a(4) =163a(5) =173a(6) =211a(7) =239a(8) =257a(9) =263a(10) =269a(11) =277a(12) =337a(13) =359a(14) =379a(15) =439a(16) =479a(17) =521a(18) =541a(19) =547a(20) =607a(21) =659a(22) =673a(23) =683a(24) =733a(25) =947a(26) =977a(27) =1019a(28) =1039a(29) =1187