Prime p concatenated with next prime is also prime.

Terms

a(0) =2a(1) =31a(2) =83a(3) =151a(4) =157a(5) =167a(6) =199a(7) =233a(8) =251a(9) =257a(10) =263a(11) =271a(12) =331a(13) =353a(14) =373a(15) =433a(16) =467a(17) =509a(18) =523a(19) =541a(20) =601a(21) =653a(22) =661a(23) =677a(24) =727a(25) =941a(26) =971a(27) =1013a(28) =1033a(29) =1181