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A163449 A007582 written in base 2. 5
1, 11, 1010, 100100, 10001000, 1000010000, 100000100000, 10000001000000, 1000000010000000, 100000000100000000, 10000000001000000000, 1000000000010000000000, 100000000000100000000000, 10000000000001000000000000, 1000000000000010000000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

For n >= 1, the digits are a "1", (n-1) times "0", a "1", and (n-1) times "0".

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..250

Index entries for linear recurrences with constant coefficients, signature (110, -1000).

FORMULA

a(n) = 10^(2n-1) + 10^(n-1) = A163664(n)/10 for n >= 1.

a(n) = A007088(A007582(n)). - Michel Marcus, Dec 24 2016

MATHEMATICA

Join[{1}, Table[10^(2n-1) + 10^(n-1), {n, 1, 25}]] (* or *) Join[{1}, LinearRecurrence[{110, -1000}, {11, 1010}, 25]] (* G. C. Greubel, Dec 24 2016 *)

PROG

(PARI) concat([1], for(n=1, 50, print1(10^(2*n-1) + 10^(n-1), ", "))) \\ G. C. Greubel, Dec 24 2016

CROSSREFS

Cf. A007088, A007582.

Sequence in context: A281277 A281176 A280459 * A288900 A288830 A289047

Adjacent sequences:  A163446 A163447 A163448 * A163450 A163451 A163452

KEYWORD

nonn,base,easy

AUTHOR

Jaroslav Krizek, Jul 27 2009

EXTENSIONS

Edited by R. J. Mathar, Aug 06 2009

STATUS

approved

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Last modified November 18 02:20 EST 2019. Contains 329243 sequences. (Running on oeis4.)