Determine if a Given Number is a Triangle Number
Is it an Armstrong number?
Narcissistic number ?
Divisible by 15
Lights Out 11 - 5x5, with wrapping, x moves
Divisible by n, prime divisors (including powers)
Divisible by n, prime divisors from 20 to 200
Lights Out 10 - 5x5, with wrapping, 6 moves
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