Primes formed by concatenating n with n-3.

Terms

a(0) =41a(1) =107a(2) =1613a(3) =2017a(4) =3229a(5) =4441a(6) =4643a(7) =5653a(8) =7673a(9) =9491a(10) =106103a(11) =116113a(12) =124121a(13) =130127a(14) =136133a(15) =170167a(16) =172169a(17) =182179a(18) =184181a(19) =196193a(20) =206203a(21) =212209a(22) =214211a(23) =220217a(24) =224221a(25) =230227a(26) =272269a(27) =274271a(28) =280277a(29) =302299