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| | The On-Line Encyclopedia of Integer Sequences |
 | | a(n) is the integer (reduced square-free) under the square root obtained when the inverse of Minkowski's question mark function is applied to the nth ratio A007305(n+1)/A047679(n-1) in the full Stern-Brocot tree, and zero when it results a rational value. |
 | | Note: the underlying function N2Q (see the Maple code) maps natural numbers 1, 2, 3, 4, 5,..., through all the positive rationals 1/1, 1/2, 2/1, 1/3, 2/3, 3/2, 3/1, 1/4,... |
 | | In his "On Numbers and Games", Conway denotes the Minkowski's question mark function with x enclosed in a box. |
| www.research.att.com /~njas/sequences/A065937 (337 words) |
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