Find how many Pythagorean triangles allow tiling with a perimeter < 100,000,000.
The prime factorisation of binomial coefficients
Powers With Trailing Digits
Comparing four-sided and six-sided dice
Find the sum of the distinct square-free numbers in the first 51 rows of Pascal’s triangle.
Find the unique positive integer for a concealed square.
Skew-cost coding
Tribonacci non-divisors
An Arithmetic Geometric sequence
Odd triplets in Pascal’s triangle.