An even number for which . The first few positive doubly even numbers are 4, 8, 12, 16, ... (OEIS A008586).
Doubly Even Number
See alsoEven Function, Odd Number, Singly Even Number
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ReferencesSloane, N. J. A. Sequence A008586 in "The On-Line Encyclopedia of Integer Sequences."
Referenced on Wolfram|AlphaDoubly Even Number
Cite this as:
Weisstein, Eric W. "Doubly Even Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/DoublyEvenNumber.html