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refac
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The answer REFAC has 0 possible clue(s) in existing crosswords.
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There are 5 letters in REFAC ( A1C3E1F4R1 )
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Definitions of refac in various dictionaries:
REFAC - A refactorable number or tau number is an integer n that is divisible by the count of its divisors, or to put it algebraically, n is such that ...
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A refactorable number or tau number is an integer n that is divisible by the count of its divisors, or to put it algebraically, n is such that * * * * τ * ( * n * ) * * | * * n * * * {\displaystyle \tau (n)|n} * . The first few refactorable numbers are listed in (sequence A033950 in the OEIS) as* 1, 2, 8, 9, 12, 18, 24, 36, 40, 56, 60, 72, 80, 84, 88, 96, 104, 108, 128, 132, 136, 152, 156, 180, 184, 204, 225, 228, 232, 240, 248, 252, 276, 288, 296, ...For example, 18 has 6 divisors (1 and 18, 2 and 9, 3 and 6) and is divisible by 6. There are infinitely many refactorable numbers. |