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A198851
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a(n) = 3*8^n-1.
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1
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2, 23, 191, 1535, 12287, 98303, 786431, 6291455, 50331647, 402653183, 3221225471, 25769803775, 206158430207, 1649267441663, 13194139533311, 105553116266495, 844424930131967, 6755399441055743, 54043195528445951
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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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a(n) = 8*a(n-1)+7. a(n) = 9*a(n-1)-8*a(n-2) for n > 1.
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MATHEMATICA
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3*8^Range[0, 30]-1 (* or *) LinearRecurrence[{9, -8}, {2, 23}, 30] (* Harvey P. Dale, Dec 07 2011 *)
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PROG
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(Magma) [3*8^n-1: n in [0..30]]
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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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