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A017257 a(n) = 9n+8. 12
8, 17, 26, 35, 44, 53, 62, 71, 80, 89, 98, 107, 116, 125, 134, 143, 152, 161, 170, 179, 188, 197, 206, 215, 224, 233, 242, 251, 260, 269, 278, 287, 296, 305, 314, 323, 332, 341, 350, 359, 368, 377, 386, 395, 404, 413, 422, 431, 440, 449, 458, 467, 476, 485 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Digital root of any number in this sequence = 8. Any partial sum of digits of any number in this sequence also belongs to this sequence. - Artur Jasinski, Dec 16 2007

a(n-1)^2 - A013656(n) * A010701(n)^2 = 1. - Vincenzo Librandi, Nov 19 2010

Subsequence of A224829: A224823(a(n)) = 0. - Reinhard Zumkeller, Jul 21 2013

LINKS

Table of n, a(n) for n=0..53.

Tanya Khovanova, Recursive Sequences

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 970

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

FORMULA

a(n) = 18*n-a(n-1)+7. - Vincenzo Librandi, Nov 19 2010

a(0)=8, a(1)=17, a(n) = 2*a(n-1)-a(n-2). G.f.: (8+x)/(1-x)^2. - Colin Barker, Jan 24 2012

MAPLE

A017257:=n->9*n+8; seq(A017257(n), n=0..100); # Wesley Ivan Hurt, Nov 30 2013

MATHEMATICA

Array[9*#+8&, 100, 0] (* Vladimir Joseph Stephan Orlovsky, Dec 14 2009 *)

PROG

(Haskell)

a017257 = (+ 8) . (* 9)

a017257_list = 8 : map (+ 9) a017257_list  -- Reinhard Zumkeller, Jul 21 2013

(PARI) a(n)=9*n+8 \\ Charles R Greathouse IV, Sep 28 2015

CROSSREFS

Cf. A013656, A010701, A008591.

Sequence in context: A031495 A224829 A273188 * A052222 A044441 A189381

Adjacent sequences:  A017254 A017255 A017256 * A017258 A017259 A017260

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 26 05:12 EDT 2017. Contains 287074 sequences.