One in not prime!!!
And therefore should not become de-primed.
Remove all the consonants
Project Euler: Problem 4, Palindromic numbers
Multiples of a Number in a Given Range
Find the Oldest Person in a Room
Scrabble Scores - 12
5 Prime Numbers
Divisible by 10
Divisible by n, prime divisors (including powers)
Divisible by n, prime divisors from 20 to 200
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