private long GetFirstTriangleNumberWithAtLeastNDivisor(int requiredNumberOfDivisors)
{
int n = 1;
var nthTriangleNumber = TriangleNumberHelper.GetNthTriangleNumber(n);
while (DivisorHelper.GetNumberOfDivisors(nthTriangleNumber) < requiredNumberOfDivisors)
{
n++;
nthTriangleNumber = TriangleNumberHelper.GetNthTriangleNumber(n);
}
return(nthTriangleNumber);
}
public void GetListOfTriangleNumbersBelowMax_WithMax56_ReturnsCorrectList()
{
// Arrange
var max = 56;
var expectedResult = new List <long> {
1, 3, 6, 10, 15, 21, 28, 36, 45, 55
};
// Act
var result = TriangleNumberHelper.GetListOfTriangleNumbersBelowMax(max);
// Assert
result.Should().BeEquivalentTo(expectedResult);
}
public void GetFirstNTriangleNumbersWhichAreAlsoPentagonalAndHexogonal_WithCount2_ReturnsCorrectList()
{
// Arrange
var count = 2;
var expectedList = new List <long> {
1, 40755
};
// Act
var result = TriangleNumberHelper.GetFirstNTriangleNumbersWhichAreAlsoPentagonalAndHexogonal(count);
// Assert
result.Should().HaveCount(2);
result.Should().BeEquivalentTo(expectedList);
}
public void GetNthTriangleNumber_ReturnsCorrectResult(int n, long nthTriangleNumber)
{
TriangleNumberHelper.GetNthTriangleNumber(n).Should().Be(nthTriangleNumber);
}
