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math.CO2020
Difference Necklaces
Ethan P. White, Richard K. Guy, Renate Scheidler
An -difference necklace of length is a circular arrangement of the integers such that any two neighbours have absolute difference or . We…
math.HO2020★ 1 cited
Fibonacci Plays Billiards
Elwyn Berlekamp, Richard K. Guy
A chain is an ordering of the integers 1 to n such that adjacent pairs have sums of a particular form, such as squares, cubes, triangular numbers, pentagonal numbers, or Fibonacci…