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A017101 8n+3. 15
3, 11, 19, 27, 35, 43, 51, 59, 67, 75, 83, 91, 99, 107, 115, 123, 131, 139, 147, 155, 163, 171, 179, 187, 195, 203, 211, 219, 227, 235, 243, 251, 259, 267, 275, 283, 291, 299, 307, 315, 323, 331, 339, 347, 355, 363, 371, 379, 387, 395, 403, 411, 419, 427 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Apart from initial term(s), dimension of the space of weight 2n cusp forms for Gamma_0( 47 ).

Also numbers of the form x^2 + y^2 + z^2, where x,y,z are odd integers. - Alexander Adamchuk, Dec 01 2006

LINKS

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

Tanya Khovanova, Recursive Sequences

William A. Stein, Dimensions of the spaces S_k(Gamma_0(N))

William A. Stein, The modular forms database

Index to sequences with linear recurrences with constant coefficients, signature (2,-1)

FORMULA

a(n) = A001969(2*n+1) + A001969(2*n) = A000069(2*n+1) + A000069(2*n). - Philippe Deléham, Feb 04 2004

G.f.: (3+5*x)/(1-x)^2. - R. J. Mathar, Mar 30 2011

a(n) = 8*n+3; a(n) = 2*a(n-1)-a(n-2); [Vincenzo Librandi, May 28 2011]

MATHEMATICA

Range[3, 1000, 8] (* From Vladimir Joseph Stephan Orlovsky, May 27 2011 *)

PROG

(MAGMA) [8*n+3: n in [0..60]]; // Vincenzo Librandi, May 28 2011

(PARI) a(n)=8*n+3 \\ Charles R Greathouse IV, Jun 02 2013

CROSSREFS

Cf. A004769, A017077, A017089.

Sequence in context: A113295 A043433 A078583 * A112422 A125994 A137295

Adjacent sequences:  A017098 A017099 A017100 * A017102 A017103 A017104

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 22 23:24 EST 2014. Contains 249835 sequences.