Denominators of continued fraction convergents to sqrt(20).

Terms

a(0) =1a(1) =2a(2) =17a(3) =36a(4) =305a(5) =646a(6) =5473a(7) =11592a(8) =98209a(9) =208010a(10) =1762289a(11) =3732588a(12) =31622993a(13) =66978574a(14) =567451585a(15) =1201881744a(16) =10182505537a(17) =21566892818a(18) =182717648081a(19) =387002188980