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A033175 n 3's followed by 1. 10
1, 31, 331, 3331, 33331, 333331, 3333331, 33333331, 333333331, 3333333331, 33333333331, 333333333331, 3333333333331, 33333333333331, 333333333333331, 3333333333333331, 33333333333333331, 333333333333333331 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

REFERENCES

F. Smarandache, Properties of numbers, University of Craiova, 1973

LINKS

M. L. Perez et al., eds., Smarandache Notions Journal

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

Index to sequences with linear recurrences with constant coefficients, signature (11,-10)

FORMULA

a(n) = (10^(n+1)-7)/3.

a(n) = 10*a(n-1)+21 (with a(0)=1) [From Vincenzo Librandi, Nov 17 2010]

G.f.: ( 1+20*x ) / ( (10*x-1)*(x-1) ). - R. J. Mathar, Aug 24 2011

MATHEMATICA

FromDigits/@Table[Join[PadLeft[{}, n, 3], {1}], {n, 0, 20}] (* From Harvey P. Dale, Oct 20 2011 *)

CROSSREFS

Cf. A051200.

Sequence in context: A029813 A138697 A186071 * A123568 A111675 A142495

Adjacent sequences:  A033172 A033173 A033174 * A033176 A033177 A033178

KEYWORD

nonn,easy

AUTHOR

Jan Jensen (dorul(AT)post6.tele.dk)

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Last modified February 17 16:00 EST 2012. Contains 206050 sequences.