Palindromic primes that yield a prime when sandwiched between two 7's. (Prefixing and suffixing a 'seven' on both sides yields another pal prime).

A088271

Palindromic primes that yield a prime when sandwiched between two 7's. (Prefixing and suffixing a 'seven' on both sides yields another pal prime).

Terms

    a(0) =2a(1) =5a(2) =131a(3) =191a(4) =797a(5) =11411a(6) =15551a(7) =30203a(8) =31013a(9) =32423a(10) =36263a(11) =36563a(12) =38183a(13) =39293a(14) =72227a(15) =74747a(16) =77477a(17) =94349a(18) =94949a(19) =1003001a(20) =1055501a(21) =1074701a(22) =1085801a(23) =1120211a(24) =1123211a(25) =1153511a(26) =1178711a(27) =1183811a(28) =1221221a(29) =1311131

External references