Absolute differences between emirps (A006567) and their reversals.

Terms

a(0) =18a(1) =54a(2) =18a(3) =36a(4) =54a(5) =36a(6) =18a(7) =18a(8) =594a(9) =198a(10) =792a(11) =594a(12) =594a(13) =792a(14) =792a(15) =198a(16) =396a(17) =396a(18) =594a(19) =594a(20) =594a(21) =198a(22) =396a(23) =198a(24) =396a(25) =594a(26) =594a(27) =198a(28) =198a(29) =198