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Date: 22-5-2020
706
Date: 1-12-2020
1485
Date: 26-4-2020
1050
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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.
name | base-16 digit order |
katadrome | strict descending |
metadrome | strict ascending |
nialpdrome | nonincreasing |
plaindrome | nondecreasing |
REFERENCES:
Sloane, N. J. A. Sequence A023757 in "The On-Line Encyclopedia of Integer Sequences."
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