Numbers k such that k-th semiprime == 2 (mod k).

Terms

a(0) =1a(1) =2a(2) =4a(3) =39a(4) =51a(5) =52a(6) =71a(7) =6920a(8) =613377a(9) =613381a(10) =613405a(11) =613433a(12) =613437a(13) =613449a(14) =613455a(15) =613536a(16) =613537a(17) =613548a(18) =613557a(19) =613569a(20) =613581a(21) =613583a(22) =613587a(23) =613588a(24) =613608a(25) =613613a(26) =58155550a(27) =58155570a(28) =6384425447a(29) =6384425465