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Date: 10-9-2020
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Date: 18-12-2019
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Date: 26-8-2020
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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.
name | base-16 digit order |
katadrome | strict descending |
metadrome | strict ascending |
nialpdrome | nonincreasing |
plaindrome | nondecreasing |
REFERENCES:
Sloane, N. J. A. Sequence A023771 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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