I try to avoid brute force solutions, but...
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Sums with Excluded Digits
Test if a Number is a Palindrome without using any String Operations
Rounding off numbers to n decimals
Binary code (array)
High Precision Square Root (Inspired by Project Euler 80)
Rolling maximums above a threshold
A (wrong) place for everything, and everything in its (wrong) place
Highest powers in factorials
Reindex a vector
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