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A177769 a(n) = 111*n. 2
111, 222, 333, 444, 555, 666, 777, 888, 999, 1110, 1221, 1332, 1443, 1554, 1665, 1776, 1887, 1998, 2109, 2220, 2331, 2442, 2553, 2664, 2775, 2886, 2997, 3108, 3219, 3330, 3441, 3552, 3663, 3774, 3885, 3996, 4107, 4218, 4329, 4440, 4551, 4662, 4773, 4884 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The reference contains also sequences A102807, A109344, A075415, and A109492.

REFERENCES

Emile Fourrey, Recreations arithmetiques, 1899 and later, Vuibert, Paris, page 11.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..10000

Index entries for linear recurrences with constant coefficients, signature (2,-1).

FORMULA

G.f.: 111*x/(x-1)^2.

a(n) = 2*a(n-1) - a(n-2).

a(n) = a(n-1) + 111.

PROG

(MAGMA) [111*n: n in [1..50]]; // Vincenzo Librandi, Aug 04 2011

CROSSREFS

Sequence in context: A033284 A333568 A123673 * A074842 A180115 A082941

Adjacent sequences:  A177766 A177767 A177768 * A177770 A177771 A177772

KEYWORD

nonn,easy

AUTHOR

Paul Curtz, May 13 2010

STATUS

approved

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Last modified April 18 16:51 EDT 2021. Contains 343089 sequences. (Running on oeis4.)