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A135262 a(3n)=10^n. a(3n+1)=4*10^n. a(3n+2)=7*10^n. 0
1, 4, 7, 10, 40, 70, 100, 400, 700, 1000, 4000, 7000, 10000, 40000, 70000, 100000, 400000, 700000, 1000000, 4000000, 7000000, 10000000, 40000000, 70000000, 100000000, 400000000, 700000000, 1000000000, 4000000000, 7000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..29.

Index entries for linear recurrences with constant coefficients, signature (0,0,10).

FORMULA

a(n) = (1/3)*{10*(n mod 3)+[(n+1) mod 3]+[(n+2) mod 3]}*10^A002264. - Paolo P. Lava, Dec 18 2007

a(n) = 10*a(n-3). O.g.f.: (1+4x+7x^2)/(1-10x^3). - R. J. Mathar, Jul 22 2008

MATHEMATICA

Flatten[Table[FromDigits[PadRight[{i}, n, 0]], {n, 10}, {i, {1, 4, 7}}]] (* or *) LinearRecurrence[{0, 0, 10}, {1, 4, 7}, 30] (* Harvey P. Dale, Jun 06 2015 *)

CROSSREFS

Sequence in context: A294914 A088405 A100591 * A061515 A071084 A175833

Adjacent sequences:  A135259 A135260 A135261 * A135263 A135264 A135265

KEYWORD

nonn,easy

AUTHOR

Paul Curtz, Dec 01 2007

EXTENSIONS

Name edited by R. J. Mathar, Jul 22 2008

STATUS

approved

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Last modified September 15 08:13 EDT 2019. Contains 327062 sequences. (Running on oeis4.)