Semiprimes of the form 5*n^2 + 1.

Terms

a(0) =6a(1) =21a(2) =46a(3) =321a(4) =501a(5) =721a(6) =1126a(7) =2206a(8) =2881a(9) =3646a(10) =3921a(11) =4501a(12) =7606a(13) =10581a(14) =11521a(15) =13521a(16) =14581a(17) =15681a(18) =16246a(19) =18001a(20) =19846a(21) =20481a(22) =21781a(23) =23806a(24) =24501a(25) =27381a(26) =30421a(27) =32001a(28) =38721a(29) =40501