Numbers k such that (k^2 - 81)/19 is a square.

Terms

a(0) =9a(1) =10a(2) =66a(3) =105a(4) =959a(5) =1530a(6) =2441a(7) =22335a(8) =35634a(9) =326050a(10) =520191a(11) =829930a(12) =7593834a(13) =12115455a(14) =110856041a(15) =176863410a(16) =282173759a(17) =2581881225a(18) =4119219066a(19) =37690727890a(20) =60133039209a(21) =95938248130a(22) =877832022666