Denominators of continued fraction convergents to sqrt(688).

Terms

a(0) =1a(1) =4a(2) =9a(3) =13a(4) =74a(5) =531a(6) =1667a(7) =12200a(8) =62667a(9) =74867a(10) =212401a(11) =924471a(12) =48284893a(13) =194064043a(14) =436412979a(15) =630477022a(16) =3588798089a(17) =25752063645a(18) =80844989024a(19) =591666986813