Primes such that applying "reverse and add" twice produces two more primes.

Terms

a(0) =271a(1) =281a(2) =21491a(3) =21991a(4) =22091a(5) =22481a(6) =23081a(7) =23971a(8) =24071a(9) =25951a(10) =26681a(11) =26981a(12) =27271a(13) =27431a(14) =27691a(15) =27791a(16) =28031a(17) =28661a(18) =28921a(19) =28961a(20) =29021a(21) =29191a(22) =29251a(23) =29411a(24) =29671a(25) =2129891a(26) =2131991a(27) =2141791a(28) =2141891a(29) =2151791