I got tired of solving these problems. So, I just wrote a solution that works for everything.
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Find the largest value in the 3D matrix
Divisible by n, prime divisors - 11, 13, 17, & 19
Sums of Multiple Pairs of Triangular Numbers
Rule of mixtures (composites) - other bound
5th Time's a Charm
Divisible by 9
Temperature Conversion Utility
Inscribed Pentagon? 2
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