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A037649 Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 3,0,1. 1
3, 21, 148, 1039, 7273, 50912, 356387, 2494709, 17462964, 122240751, 855685257, 5989796800, 41928577603, 293500043221, 2054500302548, 14381502117839, 100670514824873, 704693603774112, 4932855226418787 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..200

Index entries for linear recurrences with constant coefficients, signature (7,0,1,-7).

FORMULA

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

MATHEMATICA

Module[{nn=20, c}, c=PadRight[{}, nn, {3, 0, 1}]; Table[FromDigits[Take[c, n], 7], {n, nn}]] (* Harvey P. Dale, Aug 09 2014 *)

CROSSREFS

Sequence in context: A088088 A206638 A037761 * A037768 A037656 A074577

Adjacent sequences:  A037646 A037647 A037648 * A037650 A037651 A037652

KEYWORD

nonn,base,easy

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified February 20 17:04 EST 2020. Contains 332080 sequences. (Running on oeis4.)