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problem 35 · 5 lines

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<p>The number, $197$, is called a circular prime because all rotations of the digits: $197$, $971$, and $719$, are themselves prime.</p>
<p>There are thirteen such primes below $100$: $2, 3, 5, 7, 11, 13, 17, 31, 37, 71, 73, 79$, and $97$.</p>
<p>How many circular primes are there below one million?</p>
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