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Date: 4-5-2020
811
Date: 16-1-2020
567
Date: 7-6-2020
722
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A katadrome is a number whose hexadecimal digits are in strict descending order. The first few are 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 32, 33, 48, 49, ... (OEIS A023797), corresponding to 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10, 20, 21, 30, 31, ....
A number that is not a katadrome is a plaindrome.
The following table summarized 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 A023797 in "The On-Line Encyclopedia of Integer Sequences."
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علامات بسيطة في جسدك قد تنذر بمرض "قاتل"
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أول صور ثلاثية الأبعاد للغدة الزعترية البشرية
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مكتبة أمّ البنين النسويّة تصدر العدد 212 من مجلّة رياض الزهراء (عليها السلام)
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