Numbers of the form ab such that phi(ab) = a*b where ab is the concatenation of a and b.

Terms

a(0) =24a(1) =26a(2) =87a(3) =154a(4) =165a(5) =209a(6) =250a(7) =364a(8) =440a(9) =448a(10) =644a(11) =875a(12) =1240a(13) =1252a(14) =1269a(15) =1320a(16) =1434a(17) =1632a(18) =1640a(19) =1768a(20) =1996a(21) =2440a(22) =2480a(23) =2500a(24) =2656a(25) =2840a(26) =2842a(27) =4040a(28) =4400a(29) =5240