Numbers k such that k^2 = 12*n^2 + 13.

Terms

a(0) =5a(1) =11a(2) =59a(3) =149a(4) =821a(5) =2075a(6) =11435a(7) =28901a(8) =159269a(9) =402539a(10) =2218331a(11) =5606645a(12) =30897365a(13) =78090491a(14) =430344779a(15) =1087660229a(16) =5993929541a(17) =15149152715a(18) =83484668795a(19) =211000477781