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A175805
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a(n) = 21*2^n.
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20
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21, 42, 84, 168, 336, 672, 1344, 2688, 5376, 10752, 21504, 43008, 86016, 172032, 344064, 688128, 1376256, 2752512, 5505024, 11010048, 22020096, 44040192, 88080384, 176160768, 352321536, 704643072, 1409286144, 2818572288, 5637144576, 11274289152, 22548578304, 45097156608
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OFFSET
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0,1
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LINKS
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FORMULA
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G.f.: 21/(1-2*x).
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MATHEMATICA
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PROG
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(Magma)[21*2^n: n in [0..100]]
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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