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 A176413 a(n) = 19*3^n. 1
 19, 57, 171, 513, 1539, 4617, 13851, 41553, 124659, 373977, 1121931, 3365793, 10097379, 30292137, 90876411, 272629233, 817887699, 2453663097, 7360989291, 22082967873, 66248903619, 198746710857, 596240132571, 1788720397713 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Since 19^3 = 3^3+10^3+18^3, the cube of any multiple of 19 can be written as the sum of three positive cubes: (19*k)^3 = (3*k)^3 + (10*k)^3 + (18*k)^3. LINKS Index entries for linear recurrences with constant coefficients, signature (3). FORMULA G.f.: 19/(1-3*x). - R. J. Mathar, Aug 24 2011 MATHEMATICA 19*3^Range[0, 30] (* or *) NestList[3#&, 19, 30] (* Harvey P. Dale, Feb 03 2013 *) PROG (MAGMA) [19*3^n: n in [0..250]]; CROSSREFS Subsequence of A023042. Sequence in context: A125818 A093362 A251073 * A263336 A061973 A041702 Adjacent sequences:  A176410 A176411 A176412 * A176414 A176415 A176416 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Apr 17 2010 EXTENSIONS Comment edited by Jon E. Schoenfield, Jun 20 2010 STATUS approved

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Last modified October 13 23:47 EDT 2019. Contains 327983 sequences. (Running on oeis4.)