Numerators of continued fraction convergents to sqrt(423).

Terms

a(0) =20a(1) =21a(2) =41a(3) =144a(4) =617a(5) =1995a(6) =2612a(7) =4607a(8) =186892a(9) =191499a(10) =378391a(11) =1326672a(12) =5685079a(13) =18381909a(14) =24066988a(15) =42448897a(16) =1722022868a(17) =1764471765a(18) =3486494633a(19) =12223955664a(20) =52382317289a(21) =169370907531a(22) =221753224820a(23) =391124132351