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：2025/12/05
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(mathematics) A positive integer which is divisible by the sum of all of its digits.
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Harshad number
The mathematician explained how 18 qualifies as a Harshad number by showing it is divisible by the sum of its digits, 1 + 8 = 9.
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The mathematician explained how 18 qualifies as a Harshad number by showing it is divisible by the sum of its digits, 1 + 8 = 9.
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