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A037582
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Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,3.
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0
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1, 13, 131, 1313, 13131, 131313, 1313131, 13131313, 131313131, 1313131313, 13131313131, 131313131313, 1313131313131, 13131313131313, 131313131313131, 1313131313131313
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