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KindeX wrote:So the question is if the checker accepts only one predefined correct answer, or checks every every answer with some algorithm.

I've just solved this challenge. The answer is YES - the only one first generated number is correct answer. So, use proper random generator.

I think approximate every 1 000 000 000th number fits the criteria.
So the question is if the checker accepts only one predefined correct answer, or checks every every answer with some algorithm.
I've found many numbers that fits criteria, but site does not accept it.