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A037572 Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,2. 0
2, 15, 107, 751, 5258, 36808, 257658, 1803607, 12625251, 88376759, 618637314, 4330461200, 30313228402, 212192598815, 1485348191707, 10397437341951, 72782061393658, 509474429755608, 3566321008289258 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..19.

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

Index entries for 7-automatic sequences.

FORMULA

G.f.: x*(2+x+2*x^2) / ( (x-1)*(7*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 27 2015

A007093(a(n)) = A037575(n).

PROG

(PARI) a(n)=([0, 1, 0, 0; 0, 0, 1, 0; 0, 0, 0, 1; -7, 1, 0, 7]^(n-1)*[2; 15; 107; 751])[1, 1] \\ Charles R Greathouse IV, Feb 13 2017

CROSSREFS

Sequence in context: A308938 A037556 A037492 * A218686 A279087 A037740

Adjacent sequences:  A037569 A037570 A037571 * A037573 A037574 A037575

KEYWORD

nonn,base,easy

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified January 25 01:33 EST 2020. Contains 331229 sequences. (Running on oeis4.)