Denominators of continued fraction convergents to sqrt(686).

Terms

a(0) =1a(1) =5a(2) =21a(3) =26a(4) =47a(5) =167a(6) =381a(7) =3977a(8) =103783a(9) =1041807a(10) =2187397a(11) =7603998a(12) =9791395a(13) =17395393a(14) =79372967a(15) =414260228a(16) =21620904823a(17) =108518784343a(18) =455696042195a(19) =564214826538