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Date: 16-2-2020
565
Date: 11-10-2020
524
Date: 23-12-2019
710
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The negadecimal representation of a number is its representation in base (i.e., base negative 10). It is therefore given by the coefficients in
(1) |
|||
(2) |
where , 1, ..., 9.
The negadecimal digits may be obtained with the Wolfram Language code
Negadecimal[0] := {0}
Negadecimal[i_] := Rest @ Reverse @
Mod[NestWhileList[(# - Mod[#, 10])/-10&,
i, # != 0& ], 10]
The following table gives the negadecimal representations for the first few integers (A039723).
negadecimal | negadecimal | negadecimal | |||
1 | 1 | 11 | 191 | 21 | 181 |
2 | 2 | 12 | 192 | 22 | 182 |
3 | 3 | 13 | 193 | 23 | 183 |
4 | 4 | 14 | 194 | 24 | 184 |
5 | 5 | 15 | 195 | 25 | 185 |
6 | 6 | 16 | 196 | 26 | 186 |
7 | 7 | 17 | 197 | 27 | 187 |
8 | 8 | 18 | 198 | 28 | 188 |
9 | 9 | 19 | 199 | 29 | 189 |
10 | 190 | 20 | 180 | 30 | 170 |
The numbers having the same decimal and negadecimal representations are those which are sums of distinct powers of 100: 1, 2, 3, 4, 5, 6, 7, 8, 9, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 200, ... (OEIS A051022).
REFERENCES:
Sloane, N. J. A. Sequences A039723 and A051022 in "The On-Line Encyclopedia of Integer Sequences."
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دراسة يابانية لتقليل مخاطر أمراض المواليد منخفضي الوزن
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اكتشاف أكبر مرجان في العالم قبالة سواحل جزر سليمان
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اتحاد كليات الطب الملكية البريطانية يشيد بالمستوى العلمي لطلبة جامعة العميد وبيئتها التعليمية
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