You're *very* close with this one. Remember that r is input as a double, not a string.
Numbers with prime factors 2, 3 and 5.
Largest Twin Primes
Count letters occurence in text, specific to words with a given length.
Find nth maximum
I've got the power! (Inspired by Project Euler problem 29)
That's some divisor you've got there...
Diophantine Equations (Inspired by Project Euler, problem 66)
Pandigital Multiples of 11 (based on Project Euler 491)
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