Remove the vowels
Project Euler: Problem 4, Palindromic numbers
Divisible by 7
Pandigital Multiples of 11 (based on Project Euler 491)
Easy Sequences 6: Coefficient sums of derivatives
Easy Sequences 35: Cutting a donut to Semi-prime pieces
Easy Sequences 21: Combinatorial Summations
Easy Sequences 1: Find the index of an element
Easy Sequences 40: Quadratic Congruence
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