assert_eq!(1, squares::square_of_sum(1));

	assert_eq!(1, squares::square_of_sum(1));

    assert_eq!(225, squares::square_of_sum(5));

	assert_eq!(225, squares::square_of_sum(5));

    assert_eq!(25_502_500, squares::square_of_sum(100));

	assert_eq!(25_502_500, squares::square_of_sum(100));

    assert_eq!(1, squares::sum_of_squares(1));

	assert_eq!(1, squares::sum_of_squares(1));

    assert_eq!(55, squares::sum_of_squares(5));

	assert_eq!(55, squares::sum_of_squares(5));

    assert_eq!(338_350, squares::sum_of_squares(100));

	assert_eq!(338_350, squares::sum_of_squares(100));

    assert_eq!(0, squares::difference(1));

	assert_eq!(0, squares::difference(1));

    assert_eq!(170, squares::difference(5));

	assert_eq!(170, squares::difference(5));

    assert_eq!(25_164_150, squares::difference(100));

	assert_eq!(25_164_150, squares::difference(100));

// https://en.wikipedia.org/wiki/Triangular_number

    unimplemented!("square of sum of 1...{}", n)

	(n * (n + 1) / 2).pow(2)

// https://en.wikipedia.org/wiki/Square_pyramidal_number

    unimplemented!("sum of squares of 1...{}", n)

	n * (n + 1) * (2 * n + 1) / 6

    unimplemented!(
        "difference between square of sum of 1...{n} and sum of squares of 1...{n}",
        n = n,
    )

	square_of_sum(n) - sum_of_squares(n)