11111111111111111111111111111111111111111
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11111111888888888888888888888888881111111
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11118888888118888111111111111118888888111
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18888888811111111111888811888811111888888
18888888888888888888888111888811111888888
18888888888888888888888111888111111188888
18888888888888888888888811111111888888888
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is a prime, with 1967 digits