GCF -- Greatest Common Factor app for iPhone and iPad

GCF -- Greatest Common Factor
An App to calculate the GCF or LCM of 2 numbers.

The greatest common factor (gcf), also called greatest common divisor (gcd) of two non-zero integers is the largest positive integer that divides the numbers evenly. i.e. the gcf(8,12) is 4. The gcf is also useful for reducing fractions to its lowest terms.

The common designation for the gcf of a, b is gcf(a,b). For example, gcf(12, 18) = 6, where a = 12 and b = 18. Hence, the GCF app has two inputs labeled a and b. Two numbers are relatively prime if the gcf(a,b) = 1.

This app also will calculate the LCM, the least common multiple, of the numbers a,b, usually written as LCM(a,b). The LCM is the lowest positive integer that is a multiple of both a and b. The LCM is familiar in arithmetic as the lowest common denominator.

This app is useful in the study of greatest common factors and least common multiples and calculations involving fractions.

Features:
-- 2 inputs for a and b
-- Custom keypad for ease of input with special function keys such as: clear, delete last entry typed, next field, previous field, and GCF, LCM calculation keys
-- table of recent calculations stores the last 100 entries.
-- indicators of last calculation performed and the existence of coprimes.

Additional iPad Features:
-- Portrait and landscape modes supported
-- A clear all key on the keypad.
-- Recents table available in a popover view