Chris, I wonder how you keep coming with such new interesting problems!
I'm glad you like them!
Is the Point in a Circle?
Another colon problem
Sums of cubes and squares of sums
How many Fibonacci numbers?
Evaluate the generalized hypergeometric function
Determine the winner of a goofy golf tournament
Compute home primes in a given base
Compute a sum involving the totient over divisors of a number
List composite numbers that cannot be written as the sum of two primes
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