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Nialpdrome


A nialpdrome is a number whose hexadecimal digits are in nonincreasing order. The first few are 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 32, 33, 34, 48, 49, 50, ... (OEIS A023771), corresponding to 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10, 11, 20, 21, 22, 30, 31, 32, ....

A number that is not a nialpdrome is a metadrome.

The following table summarized related classes of numbers.

namebase-16 digit order
katadromestrict descending
metadromestrict ascending
nialpdromenonincreasing
plaindromenondecreasing

See also

Digit, Hexadecimal, Katadrome, Metadrome, Plaindrome

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References

Sloane, N. J. A. Sequence A023771 in "The On-Line Encyclopedia of Integer Sequences."

Referenced on Wolfram|Alpha

Nialpdrome

Cite this as:

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

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