a(n) is the smallest k such that phi(k) = reverse(k-n), or 0 if no such k exists.

Terms

a(0) =2a(1) =4a(2) =9a(3) =6a(4) =26a(5) =10a(6) =15a(7) =12a(8) =6543a(9) =52a(10) =74a(11) =18a(12) =76a(13) =56a(14) =36a(15) =24a(16) =289a(17) =27888a(18) =43a(19) =104a(20) =42a(21) =30a(22) =63449a(23) =46a(24) =49a(25) =6398a(26) =115a(27) =51a(28) =2561a(29) =72