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In 6-digit fredholl number, all numbers must consist of three digits A, and three digits B. So a sum of their digits is 3A+3B 3A+3B=3(A+B) and this number is divisible by 3, Therefore any 6-digit fredholl number is divisible by 3. If a number is divisible by any other number than 1 and itself, we call that number a composite number.
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