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A017209 a(n) = 9*n+4. 14
4, 13, 22, 31, 40, 49, 58, 67, 76, 85, 94, 103, 112, 121, 130, 139, 148, 157, 166, 175, 184, 193, 202, 211, 220, 229, 238, 247, 256, 265, 274, 283, 292, 301, 310, 319, 328, 337, 346, 355, 364, 373, 382, 391, 400, 409, 418, 427, 436, 445, 454, 463, 472, 481 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Numbers whose digital root is 4. - L. Edson Jeffery, Nov 26 2016

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..5000

Tanya Khovanova, Recursive Sequences

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

FORMULA

G.f.: (4+5*x) / (x-1)^2. - R. J. Mathar, Jul 14 2016

A010888(a(n)) = 4. - L. Edson Jeffery, Nov 26 2016

MATHEMATICA

Range[4, 1000, 9] (* Vladimir Joseph Stephan Orlovsky, May 28 2011 *)

PROG

(PARI) forstep(n=4, 500, 9, print1(n", ")) \\ Charles R Greathouse IV, May 28 2011

(MAGMA) [9*n+4: n in [0..60]]; // Vincenzo Librandi, Jul 23 2011

CROSSREFS

Cf. A008591, A010888, A017185, A017197.

Sequence in context: A153193 A043469 A067396 * A052218 A183148 A202089

Adjacent sequences:  A017206 A017207 A017208 * A017210 A017211 A017212

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified May 23 23:53 EDT 2017. Contains 286937 sequences.