A119764 Smallest number whose square begins with n in binary.

1, 2, 5, 2, 9, 5, 15, 4, 3, 9, 19, 5, 21, 15, 11, 4, 33, 6, 25, 9, 13, 19, 39, 7, 5, 29, 21, 15, 61, 11, 45, 8, 65, 33, 67, 6, 49, 35, 25, 9, 73, 13, 53, 106, 19, 77, 39, 79, 7, 10, 81, 29, 83, 59, 21, 15, 43, 61, 87, 11, 89, 63, 45, 8, 23, 65, 93, 33, 47, 67, 135, 12, 97, 69, 49