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Concrete mathematics : a foundation for computer science

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152 NUMBER THEORY<br />

73 If the 0(n) + 1 terms of the Farey series<br />

were fairly evenly distributed, we would expect 3n(k) z k/@(n). There<strong>for</strong>e<br />

the sum D(n) = ~~~‘[3~(k) - k/O(n)1 measures the “deviation<br />

of 3,, from uni<strong>for</strong>mity!’ Is it true that D(n) = 0 (n1/2+E) <strong>for</strong> all e > O?<br />

74 Approximately how many distinct values are there in the set {O! mod p,<br />

l!modp,...,(p-l)!modp},asp+oo?

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