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 A037670 Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 3,2,0. 1
 3, 23, 161, 1130, 7912, 55384, 387691, 2713839, 18996873, 132978114, 930846800, 6515927600, 45611493203, 319280452423, 2234963166961, 15644742168730, 109513195181112, 766592366267784, 5366146563874491 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 Index entries for linear recurrences with constant coefficients, signature (7,0,1,-7). FORMULA a(1)=3, a(2)=23, a(3)=161, a(4)=1130, a(n)=7*a(n-1)+a(n-3)-7*a(n-4) [From Harvey P. Dale, Oct 15 2011] G.f.: (2*x+3)/(7*x^4-x^3-7*x+1) [From Harvey P. Dale, Oct 15 2011] MATHEMATICA With[{nn=10}, Table[FromDigits[Take[PadLeft[{}, 3nn, {3, 2, 0}], n], 7], {n, 3nn}]] (* or *) LinearRecurrence[{7, 0, 1, -7}, {3, 23, 161, 1130}, 30] (* Harvey P. Dale, Oct 15 2011 *) CROSSREFS Sequence in context: A209011 A164536 A037789 * A037796 A212395 A027141 Adjacent sequences:  A037667 A037668 A037669 * A037671 A037672 A037673 KEYWORD nonn,base,easy AUTHOR STATUS approved

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Last modified June 25 07:53 EDT 2019. Contains 324347 sequences. (Running on oeis4.)