Smallest k such that tau(k)=reversal(k-n).

Terms

a(0) =3a(1) =6a(2) =5a(3) =8a(4) =7a(5) =9a(6) =407a(7) =68a(8) =11a(9) =14a(10) =13a(11) =18a(12) =413a(13) =20a(14) =17a(15) =24a(16) =19a(17) =22a(18) =49a(19) =21020a(20) =23a(21) =25a(22) =27a(23) =104a(24) =65a(25) =32a(26) =29a(27) =628a(28) =31a(29) =34