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A135262
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a(3n)=10^n. a(3n+1)=4*10^n. a(3n+2)=7*10^n.
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0
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1, 4, 7, 10, 40, 70, 100, 400, 700, 1000, 4000, 7000, 10000, 40000, 70000, 100000, 400000, 700000, 1000000, 4000000, 7000000, 10000000, 40000000, 70000000, 100000000, 400000000, 700000000, 1000000000, 4000000000, 7000000000
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