13 is a Prime number because it has only two factors which are itself and one
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10*1.3 = 13 is one of infinitely many possible answers.
i will go up to 15 times 13013263952657891104117130143156169182195
x+2y=13 has infinite answers, because you have two variables and only one equation.
Although there are a number of answers, most likely you are looking for 49.
13