Prime spiral

Author:Lamberto Lamberti

The prime spiral, also known as Ulam's spiral, is a plot in which the positive integers are arranged in a spiral, with primes indicated in some way along the spiral. http://mathworld.wolfram.com/PrimeSpiral.html

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Dividing a 2-digit number by a 1-digit number (2)
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Dividing a 2-digit number by a 1-digit number (1)
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