Denominators of continued fraction convergents to sqrt(180).

Terms

a(0) =1a(1) =2a(2) =5a(3) =12a(4) =317a(5) =646a(6) =1609a(7) =3864a(8) =102073a(9) =208010a(10) =518093a(11) =1244196a(12) =32867189a(13) =66978574a(14) =166824337a(15) =400627248a(16) =10583132785a(17) =21566892818a(18) =53716918421a(19) =129000729660