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COMMENTS
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Digits 3,1,4,... are indexed 1,2,3,...,.
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EXAMPLE
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The repeated digits are 3, 3, 1, 6, 3, 4, 7, ..., i.e., at position a(1) = 1, there is one '3', starting at position a(2) = 25, there are two '3's, from position a(3) = 154 on, there are three '1's, etc.
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