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A198274
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a(n) = 13*2^n-1.
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6
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12, 25, 51, 103, 207, 415, 831, 1663, 3327, 6655, 13311, 26623, 53247, 106495, 212991, 425983, 851967, 1703935, 3407871, 6815743, 13631487, 27262975, 54525951, 109051903, 218103807, 436207615, 872415231, 1744830463, 3489660927, 6979321855, 13958643711
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OFFSET
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0,1
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COMMENTS
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LINKS
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FORMULA
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a(n+1) = 2*a(n) + 1.
G.f.: ( 12-11*x ) / ( (2*x-1)*(x-1) ). - R. J. Mathar, Oct 25 2011
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EXAMPLE
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a(2) = 13*2^2-1 = 51.
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MATHEMATICA
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LinearRecurrence[{3, -2}, {12, 25}, 40] (* Harvey P. Dale, Feb 06 2019 *)
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PROG
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(BASIC) for j = 0 to 30 : print str$((13*2^j)-1)+", "; : next j
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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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