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A105431
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Primes of form R_n + 2 {= (10^n + 17)/9}, R_n being the n-th repunit, i.e. primes consisting of a string of 1's followed by a terminal 3.
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0
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3, 13, 113, 1113, 111113, 1111111113, 111111111113, 1111111111111111111111113, 1111111111111111111111111111111111111111111111111111111111111111111111111111111111113
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