Numbers k that divide prime(k)+1 or prime(k)-1.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =10a(7) =12a(8) =14a(9) =70a(10) =72a(11) =181a(12) =182a(13) =440a(14) =1053a(15) =6458a(16) =6459a(17) =6460a(18) =6461a(19) =6466a(20) =6471a(21) =40087a(22) =40089a(23) =100362a(24) =251712a(25) =251732a(26) =251737a(27) =251742a(28) =637236a(29) =637320