Numbers k such that the k-th semiprime == 9 (mod k).

Terms

a(0) =1a(1) =3a(2) =5a(3) =6a(4) =13a(5) =15a(6) =80a(7) =86a(8) =6905a(9) =6907a(10) =6908a(11) =6913a(12) =6917a(13) =613373a(14) =613409a(15) =613420a(16) =613421a(17) =613430a(18) =613506a(19) =613534a(20) =613573a(21) =613578a(22) =613600a(23) =58155529a(24) =58155553a(25) =6384425450a(26) =6384425452a(27) =6384425462a(28) =6384425495a(29) =6384425507