Numbers k such that the continued fraction for sqrt(k) has period 21.

Terms

a(0) =181a(1) =277a(2) =394a(3) =397a(4) =409a(5) =433a(6) =641a(7) =809a(8) =953a(9) =1217a(10) =1277a(11) =1489a(12) =1637a(13) =1861a(14) =2089a(15) =2146a(16) =2257a(17) =2314a(18) =2393a(19) =2425a(20) =2693a(21) =2762a(22) =2825a(23) =3098a(24) =3425a(25) =3977a(26) =3989a(27) =4777a(28) =5165a(29) =5237