A031819 Numbers n such that period of continued fraction for sqrt(n) contains exactly 51 ones.

13939, 28531, 40891, 50059, 52264, 55183, 58927, 65656, 66887, 73051, 82519, 94824, 108539, 111896, 113263, 114955, 119743, 131723, 131811, 133867, 147823, 155803, 158299, 161155, 162819, 163283, 169336, 169663, 169675, 176623, 180671, 187039