The number is ‘6174’ and ‘495’ is called ‘Kaprekar’s constant’ as this was discovered by an Indian mathematician D. R. Kaprekar.
What it does?
Step one: Take any 4 digit number let’s say ‘6354’
Step two: sort it in descending and assign it to ‘a’
So, a = 6543
Step three: sort it in ascending and assign it to ‘b’
So, b = 3456
Step four: (a-b) and assign to a
So, a = 3087
Repeat:
a = 8730
b = 0378
(a-b) = 8352
Repeat:
a = 8532
b = 2358
(a-b) = 6174
Repeat:
a = 7641
b = 1467
(a-b) = 6174
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| 熱門國家 | 系統支援 | 版本 | 費用 | APP評分 | 上架日期 | 更新日期 |
|---|---|---|---|---|---|---|
| 未知 | Android Google Play | 1.0 App下載 | 免費 | 1970-01-01 | 2015-03-11 |
