Welcome to three new puzzles. Solutions to the first two will be published next month; the third is (as yet) unsolved. In fact, this time it's a famously unsolved problem.
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Home → Magazine Archive → August 2011 (Vol. 54, No. 8) → Puzzled: Uncommon Divisors → Abstract
Puzzled: Uncommon Divisors
By Peter Winkler
Communications of the ACM,
Vol. 54 No. 8, Page 120
10.1145/1978542.1978567
![[article image]](https://cacm.acm.org/system/assets/0000/1670/101509_CACMpg112_Peter_Winkler.large.jpg?1476779415&1255634740 "Peter Winkler scrambled")
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