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Plaindrome


A plaindrome is a number whose hexadecimal digits are in nondecreasing order. The first few are 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, ... (OEIS A023757).

A number that is not a plaindrome is called a katadrome.

The following table summarizes related classes of numbers.

namebase-16 digit order
katadromestrict descending
metadromestrict ascending
nialpdromenonincreasing
plaindromenondecreasing

See also

Digit, Hexadecimal, Katadrome, Metadrome, Nialpdrome

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References

Sloane, N. J. A. Sequence A023757 in "The On-Line Encyclopedia of Integer Sequences."

Referenced on Wolfram|Alpha

Plaindrome

Cite this as:

Weisstein, Eric W. "Plaindrome." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Plaindrome.html

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