public override long LongIndexOf(BigInteger item)
{
if (item.Sign <= 0)
{
return(-1L);
}
if (item == BigInteger.One)
{
return(0L);
}
if (_num.Sign <= 0)
{
return(-1L);
}
if (!(_num % item).IsZero)
{
return(-1L);
}
long index = 0L, mult = 1L;
using (var x = _factors.GetEnumerator())
{
using (var y = _prime.Factors(item).ToLookup(z => z).GetEnumerator())
{
y.MoveNext();
while (x.MoveNext())
{
if (x.Current.Key == y.Current.Key)
{
index += y.Current.Count() * mult;
if (!y.MoveNext())
{
break;
}
}
mult *= x.Current.Count() + 1L;
}
}
}
return(index);
}
public BigDivisor(BigInteger num, BigPrime prime)
{
_factors = prime.Factors(num).ToLookup(x => x);
_num = num;
_prime = prime;
}