Numbers k such that k^2 + 23 is twice a square.

Terms

a(0) =3a(1) =7a(2) =25a(3) =45a(4) =147a(5) =263a(6) =857a(7) =1533a(8) =4995a(9) =8935a(10) =29113a(11) =52077a(12) =169683a(13) =303527a(14) =988985a(15) =1769085a(16) =5764227a(17) =10310983a(18) =33596377a(19) =60096813a(20) =195814035a(21) =350269895a(22) =1141287833a(23) =2041522557a(24) =6651912963a(25) =11898865447a(26) =38770189945a(27) =69351670125a(28) =225969226707a(29) =404211155303