The least number s having exactly n fours in the continued fraction of sqrt(s).

Terms

a(0) =2a(1) =5a(2) =52a(3) =329a(4) =379a(5) =639a(6) =631a(7) =3937a(8) =1471a(9) =2461a(10) =2524a(11) =6931a(12) =3259a(13) =11809a(14) =5659a(15) =16756a(16) =8779a(17) =14749a(18) =10399a(19) =24721a(20) =14452a(21) =25429a(22) =16669a(23) =31021a(24) =16879a(25) =45301a(26) =21061a(27) =45109a(28) =31054a(29) =72721