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A153848 Repeat 21. 0
21, 2121, 212121, 21212121, 2121212121, 212121212121, 21212121212121, 2121212121212121, 212121212121212121, 21212121212121212121, 2121212121212121212121, 212121212121212121212121 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

Index entries for linear recurrences with constant coefficients, signature (101,-100).

FORMULA

a(n) = (10^(2*n)-1)*21/99.

PROG

(PARI) g2(n) = (10^(2*n)-1)*1*21/99 for(x=1, 25, print1(g2(x), ", "))

CROSSREFS

Sequence in context: A265175 A300577 A304643 * A221771 A007593 A219104

Adjacent sequences:  A153845 A153846 A153847 * A153849 A153850 A153851

KEYWORD

nonn,easy

AUTHOR

Cino Hilliard, Jan 02 2009

STATUS

approved

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Last modified October 23 08:57 EDT 2019. Contains 328345 sequences. (Running on oeis4.)