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A053379
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a(n) contains n digits (either '7' or '8') and is divisible by 2^n.
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0
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8, 88, 888, 7888, 77888, 877888, 7877888, 87877888, 787877888, 8787877888, 88787877888, 888787877888, 8888787877888, 88888787877888, 788888787877888, 8788888787877888, 88788888787877888, 888788888787877888
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