A good opportunity to implement a hashtable: lots of collisions without it.
A re-post of Solution 1137054, because that one doesn't appear in the list of solutions, for some reason (I'm not sure why).
Find the palindrome
Test for balanced parentheses
Project Euler: Problem 16, Sums of Digits of Powers of Two
Duplicate each element of a vector.
Integer Sequence - II : New Fibonacci
Magic is simple (for beginners)
Mysterious digits operation (easy)
Narcissistic number ?
Pandigital number n°2 (Inspired by Project Euler 32)
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