Semiprimes of the form n^3 + n^2 + n + 1.

Terms

a(0) =4a(1) =15a(2) =85a(3) =259a(4) =1111a(5) =4369a(6) =47989a(7) =65641a(8) =291919a(9) =2016379a(10) =2214031a(11) =3397651a(12) =3820909a(13) =5864581a(14) =9305311a(15) =13881841a(16) =15687751a(17) =16843009a(18) =19756171a(19) =22030681a(20) =28746559a(21) =62256349a(22) =64160401a(23) =74264821a(24) =79692331a(25) =101412319a(26) =117889591a(27) =172189309a(28) =185518471a(29) =191435329