Nonprimes k such that k divides prime(k)^2 - 1.

Terms

a(0) =1a(1) =4a(2) =6a(3) =8a(4) =10a(5) =12a(6) =14a(7) =20a(8) =24a(9) =42a(10) =48a(11) =60a(12) =63a(13) =70a(14) =72a(15) =80a(16) =84a(17) =108a(18) =120a(19) =124a(20) =126a(21) =153a(22) =156a(23) =182a(24) =240a(25) =246a(26) =264a(27) =286a(28) =327a(29) =372