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Search: id:A110774
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| A110774 |
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Copies of 1 and 3 alternately such that every partial concatenation is a prime. |
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16
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| 11, 3, 11, 33, 1111111, 3333333333, 11111111111111111111111111111111111111111111111111111111111111111111111111111111\ 111111111111111111111
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