Denominators of continued fraction convergents to sqrt(643).

Terms

a(0) =1a(1) =2a(2) =3a(3) =11a(4) =14a(5) =235a(6) =1894a(7) =4023a(8) =5917a(9) =9940a(10) =55617a(11) =1400365a(12) =7057442a(13) =8457807a(14) =15515249a(15) =39488305a(16) =331421689a(17) =5342235329a(18) =5673657018a(19) =22363206383a(20) =28036863401a(21) =78436933185