2f! :/
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A double-sharp resembles a small letter "x."
If N is the number, and f is the number that you want to test as a possible factor, then first of all:test N > f (this must be true, the factors are always smaller in magnitude)next perform N ÷ f (N divided by f). If the quotient (answer to a division problem) is a whole number with no remainder or fractional part, then f is a factor of N.If the quotient is not a whole number (meaning there is a remainder), then f is not a factor.
t=5f t is the number of toes F is the number of feet
50/f
Do you mean like a double floating point number, which is a complex number; or a double matrix type number like in the related link on springerlink.com