Nonprimes of the form (k^2+1)/2.

Terms

a(0) =1a(1) =25a(2) =85a(3) =145a(4) =221a(5) =265a(6) =365a(7) =481a(8) =545a(9) =685a(10) =841a(11) =925a(12) =1105a(13) =1405a(14) =1513a(15) =1625a(16) =1985a(17) =2245a(18) =2665a(19) =2813a(20) =2965a(21) =3281a(22) =3445a(23) =3785a(24) =3961a(25) =4141a(26) =4325a(27) =4705a(28) =4901a(29) =5305