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 A017209 a(n) = 9*n+4. 15
 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: A304905 A043469 A067396 * A052218 A183148 A202089 Adjacent sequences:  A017206 A017207 A017208 * A017210 A017211 A017212 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified August 21 22:52 EDT 2018. Contains 313958 sequences. (Running on oeis4.)