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package factors
// MTC returns the multiplication table complexity of a radix n.
// This is an estimate of how difficult it is to learn a radix's
// multiplication table.
func MTC(n uint64) uint64 {
mtc := uint64(0)
for i := uint64(2); i <= n-2; i++ {
mtc += n / gcd(i, n)
}
return mtc
}
func gcd(a, b uint64) uint64 {
for b > 0 {
a, b = b, a%b
}
return a
}
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