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A137287
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a(n) = the number 2 written (p(n)-1)/2 times followed with digit 1; p(n) n-th prime number; a(1)=2.
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0
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2, 21, 221, 2221, 222221, 2222221, 222222221, 2222222221, 222222222221, 222222222222221, 2222222222222221, 2222222222222222221, 222222222222222222221, 2222222222222222222221
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