Number of integers k such that phi(k) = 10^n.

Terms

a(0) =2a(1) =2a(2) =4a(3) =11a(4) =16a(5) =24a(6) =43a(7) =63a(8) =94a(9) =152a(10) =224a(11) =324a(12) =464a(13) =644a(14) =897a(15) =1271a(16) =1790a(17) =2521a(18) =3501a(19) =4814a(20) =6535a(21) =8779a(22) =11739a(23) =15585a(24) =20625a(25) =27166a(26) =35588a(27) =46363a(28) =60065a(29) =77424