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A086940
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a(n) = k where R(k+4)=2.
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2
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16, 196, 1996, 19996, 199996, 1999996, 19999996, 199999996, 1999999996, 19999999996, 199999999996, 1999999999996, 19999999999996, 199999999999996, 1999999999999996, 19999999999999996, 199999999999999996
(list; graph; refs; listen; history; internal format)
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