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A037649
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Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 3,0,1.
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1
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3, 21, 148, 1039, 7273, 50912, 356387, 2494709, 17462964, 122240751, 855685257, 5989796800, 41928577603, 293500043221, 2054500302548, 14381502117839, 100670514824873, 704693603774112, 4932855226418787
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OFFSET
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1,1
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LINKS
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FORMULA
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a(n) = 7*a(n-1)+a(n-3)-7*a(n-4). G.f.: x*(x^2+3) / ((x-1)*(7*x-1)*(x^2+x+1)). - Colin Barker, Aug 09 2014
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MATHEMATICA
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Module[{nn=20, c}, c=PadRight[{}, nn, {3, 0, 1}]; Table[FromDigits[Take[c, n], 7], {n, nn}]] (* Harvey P. Dale, Aug 09 2014 *)
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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STATUS
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approved
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