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A139606 a(n) = 15*n + 6. 8
6, 21, 36, 51, 66, 81, 96, 111, 126, 141, 156, 171, 186, 201, 216, 231, 246, 261, 276, 291, 306, 321, 336, 351, 366, 381, 396, 411, 426, 441, 456, 471, 486, 501, 516, 531, 546, 561, 576, 591, 606, 621, 636, 651, 666, 681, 696, 711, 726, 741, 756, 771, 786 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
COMMENTS
Numbers of the 6th column of positive numbers in the square array of nonnegative and polygonal numbers A139600.
6th transversal numbers (or 6-transversal numbers): (A000217(6)-6)*n + 6.
REFERENCES
A. H. Beiler, Recreations in the Theory of Numbers, Dover, NY, 1964, p. 189. - From N. J. A. Sloane, Dec 01 2012
LINKS
FORMULA
a(n) = A057145(n+2,6).
G.f.: 3*(2+3*x)/(x-1)^2 . - R. J. Mathar, Jul 28 2016
MATHEMATICA
Range[6, 1000, 15] (* Vladimir Joseph Stephan Orlovsky, May 31 2011 *)
15*Range[0, 60]+6 (* or *) LinearRecurrence[{2, -1}, {6, 21}, 60] (* Harvey P. Dale, Aug 09 2019 *)
PROG
(PARI) a(n)=15*n+6 \\ Charles R Greathouse IV, Oct 05 2011
(Magma) [15*n+6 : n in [0..60]]; // Vincenzo Librandi, Oct 06 2011
CROSSREFS
Sequence in context: A115702 A003340 A345813 * A047717 A089982 A151943
KEYWORD
easy,nonn
AUTHOR
Omar E. Pol, Apr 27 2008
STATUS
approved

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Last modified March 19 01:57 EDT 2024. Contains 370952 sequences. (Running on oeis4.)