Composite numbers k such that p^(k-1) == 1 (mod k) for every prime p strongly prime to k.

Terms

a(0) =4a(1) =6a(2) =561a(3) =1105a(4) =1729a(5) =2465a(6) =2821a(7) =6601a(8) =8911a(9) =10585a(10) =15841a(11) =29341a(12) =41041a(13) =46657a(14) =52633a(15) =62745a(16) =63973a(17) =75361a(18) =101101a(19) =115921a(20) =126217a(21) =162401a(22) =172081a(23) =188461a(24) =252601a(25) =278545a(26) =294409a(27) =314821a(28) =334153a(29) =340561