private int GetAnswerForLargestDivisor(int largestDivisor)
{
List <int> allPrimesBelow20 = PrimeGenerator.GetPrimeListWithMaxValue(largestDivisor);
List <int> primesToLargestPowerStillBelow20 = allPrimesBelow20.Select(
a =>
(int)Math.Pow(a,
(int)(Math.Log(largestDivisor) / Math.Log(a))
)).ToList();
int smallestAnswer = primesToLargestPowerStillBelow20.Aggregate((a, b) => a * b);
return(smallestAnswer);
}
private long GetAnswerWithMaxPrime(int maxPrime)
{
List <int> primes = PrimeGenerator.GetPrimeListWithMaxValue(maxPrime);
return(primes.Sum(a => (long)a));
}