Change Log
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1.0.3 (24/09/2020)
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- minor corrections

1.0.1 (24/09/2020)
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- now each function returns "None" when 1 or more arguments are not valid

1.0.0 (23/09/2020)
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- First Release >>> 13 math functions included:
    1)  floor
    2)  ceiling
    3)  fractional part
    4)  nth root of a number
    5)  linear congruence solver
    6)  greatest common divisor
    7)  least common multiple
    8)  divisors of a number
    9)  nth prime number
    10) number of primes less than a given number (pi function)
    11) prime factorization of a number
    12) factorial of a number
    13) collatz conjecture checker