public BigInteger Solve(BigInteger?input = null)
{
int numberOfDivisors = 0;
int i = 2, triangleNumber = 1;
while (numberOfDivisors < 500)
{
numberOfDivisors = 0;
triangleNumber += i;
int testNumber = triangleNumber;
Dictionary <int, int> divisors = DivisorsHelper.CalculatePrimeDivisors(testNumber, PrimeHelper.FindPrimesUnderLimit(200000000));
numberOfDivisors = divisors.Values.ElementAt(0) + 1;
for (int l = 1; l < divisors.Count; l++)
{
numberOfDivisors *= divisors.Values.ElementAt(l) + 1;
}
i++;
}
return(triangleNumber);
}
public async Task <Response> CalcDivisors(int Number)
{
return(await Task.FromResult(new Response(new
{
Divisors = string.Join(", ", DivisorsHelper.GetDivisors(Number)),
Primes = string.Join(", ", DivisorsHelper.GetPrimeNumers(DivisorsHelper.GetDivisors(Number)))
})));
}
public BigInteger Solve(BigInteger?input = null)
{
var primes = PrimeHelper.FindPrimesUnderLimit(28124);
List <int> abundantNumbers = new List <int>();
for (int i = 2; i < 28124; i++)
{
if (DivisorsHelper.SumOfProperDivisors(i, primes) > i)
{
abundantNumbers.Add(i);
}
}
BigInteger result = 0;
bool[] canBeSummed = new bool[28124];
for (int i = 0; i < abundantNumbers.Count; i++)
{
for (int j = 0; j < abundantNumbers.Count; j++)
{
if (abundantNumbers[i] + abundantNumbers[j] >= 28124)
{
break;
}
canBeSummed[abundantNumbers[i] + abundantNumbers[j]] = true;
}
}
for (int i = 1; i < 28124; i++)
{
if (!canBeSummed[i])
{
result += i;
}
}
return(result);
}
public BigInteger Solve(BigInteger?input = null)
{
BigInteger result = 0;
bool[] primesUnderLimit = PrimeHelper.FindPrimesUnderLimit(10001);
for (int i = 2; i < 10000; i++)
{
if (primesUnderLimit[i])
{
continue;
}
BigInteger sumOfDivisors = DivisorsHelper.SumOfDivisors(i, primesUnderLimit) - i;
if (sumOfDivisors < 10000 &&
sumOfDivisors != i &&
DivisorsHelper.SumOfDivisors((int)sumOfDivisors, primesUnderLimit) - sumOfDivisors == i)
{
result += i;
}
}
return(result);
}
public void CalcPrimeTestExpected()
{
CollectionAssert.AreEqual(ExpectedPrime, DivisorsHelper.GetPrimeNumers(DivisorsHelper.GetDivisors(45)));
}
public void CalcPrimeTestIsNotNull()
{
Assert.IsNotNull(DivisorsHelper.GetPrimeNumers(DivisorsHelper.GetDivisors(45)));
}
public void CalcDivisorsTestIsNotNull()
{
Assert.IsNotNull(DivisorsHelper.GetDivisors(45));
}
public void CalcDivisorsTestExpected()
{
CollectionAssert.AreEqual(Expected, DivisorsHelper.GetDivisors(45));
}
