Is there an eight-digit number without zero digits, which when divided by the first digit gives the remainder , when divided by the second digit will give the remainder , ..., when divided by the eighth digit will give the remainder ?
Solution
We are tasked with determining if there exists an eight-digit number, where none of its digits is zero, that satisfies the following conditions:
1. When the number is divided by its first digit, the remainder is 1.
2. When the number is divided by its second digit, the remainder is 2.
3. When the number is divided by its third digit, the remainder is 3.
4. When the number is divided by its fourth digit, the remainder is 4.
5. When the number is divided by its fifth digit, the remainder is 5.
6. When the number is divided by its sixth digit, the remainder is 6.
7. When the number is divided by its seventh digit, the remainder is 7.
8. When the number is divided by its eighth digit, the remainder is 8.
Let's denote the eight-digit number by , and its digits by such that .
Given the conditions:
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Analyzing these requirements, each must be greater than the constant residues, namely , , , , .
Because are each digits (from 1 to 9), the condition implies that must be greater than 8. However, since digits can only be from 1 to 9, the only possible value for would then be 9. But since is not a digit.
This contradiction indicates that no such eight-digit number exists because it is not possible to satisfy all of the conditions with digits from 1 to 9. Thus: