Numbers n such that prime(n) == -1 (mod n).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =10a(5) =70a(6) =72a(7) =182a(8) =440a(9) =1053a(10) =6458a(11) =6461a(12) =6471a(13) =40087a(14) =40089a(15) =251737a(16) =251742a(17) =637320a(18) =637334a(19) =637336a(20) =1617173a(21) =4124466a(22) =10553445a(23) =10553455a(24) =10553569a(25) =10553570a(26) =10553574a(27) =10553576a(28) =10553819a(29) =10553829