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11 votes
18 answers
1k views

Find the nth Mersenne Prime

11 votes
18 answers
476 views

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46 answers
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20 votes
16 answers
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15 votes
28 answers
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56 votes
68 answers
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24 answers
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148 votes
310 answers
39k views

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53 answers
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30 votes
29 answers
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38 votes
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14 votes
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IMO Question Six with a difference

15 votes
13 answers
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Count alternating permutations

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