Keith Clusters
A Keith cluster is a related set of Keith numbers such that one is a multiple of another. For example, (14, 28), (1104, 2208), and (31331, 62662, 93993). These are possibly the only three examples of a Keith cluster.
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Famous quotes containing the words keith and/or clusters:
“The honest poor can sometimes forget poverty. The honest rich can never forget it.”
—Gilbert Keith Chesterton (1874–1936)
“Where we such clusters had,
As made us nobly wild, not mad;
And yet each verse of thine
Outdid the meat, outdid the frolic wine.”
—Robert Herrick (1591–1674)