Amicable Pair/Examples/220-284/Historical Note

Historical Note on the Amicable Pair $220$ and $284$

The amicable pair $220$ and $284$ were, according to Iamblichus Chalcidensis, known to Pythagoras of Samos.

However, it is strongly supposed by some commentators that they were known even further back than that.


Sources

  • 1919: Leonard Eugene Dickson: History of the Theory of Numbers: Volume $\text { I }$ ... (previous) ... (next): Preface
  • 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $220$
  • 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $220$
  • 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): amicable numbers
  • 2021: Richard Earl and James Nicholson: The Concise Oxford Dictionary of Mathematics (6th ed.) ... (previous) ... (next): amicable numbers
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