Denominators of continued fraction convergents to sqrt(421).

Terms

a(0) =1a(1) =1a(2) =2a(3) =27a(4) =137a(5) =164a(6) =629a(7) =793a(8) =2215a(9) =3008a(10) =5223a(11) =8231a(12) =21685a(13) =203396a(14) =225081a(15) =1778963a(16) =5561970a(17) =18464873a(18) =42491716a(19) =103448305a(20) =352836631a(21) =1161958198a(22) =8486544017a(23) =9648502215a(24) =95323063952a(25) =200294630119a(26) =295617694071a(27) =495912324190a(28) =791530018261