Showing what's behind the curtain

Find the sum of the distinct square-free numbers in the first 51 rows of Pascal’s triangle.

Comparing four-sided and six-sided dice

Find the unique positive integer for a concealed square.

Integer partition equations

Skew-cost coding

Tribonacci non-divisors

The prime factorisation of binomial coefficients

Odd triplets in Pascal’s triangle.

Find fractions that cannot be cancelled down (resilient fraction).

Prime Subset Sums