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 A147651 First trisection of A028560. 1
 0, 27, 72, 135, 216, 315, 432, 567, 720, 891, 1080, 1287, 1512, 1755, 2016, 2295, 2592, 2907, 3240, 3591, 3960, 4347, 4752, 5175, 5616, 6075, 6552, 7047, 7560, 8091, 8640, 9207, 9792, 10395, 11016 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Nonnegative k such that k/9 + 1 is a square. - Bruno Berselli, Apr 10 2018 LINKS Table of n, a(n) for n=0..34. Index entries for linear recurrences with constant coefficients, signature (3,-3,1). FORMULA a(n) = 9*n*(n+2). a(n) = a(n-1) + 9*A144396(n) for n>0. MATHEMATICA Table[9 n (n + 2), {n, 0, 40}] (* Harvey P. Dale, Feb 20 2011 *) PROG (PARI) a(n)=9*n*(n+2) \\ Charles R Greathouse IV, Jun 17 2017 CROSSREFS Cf. A144396, A144454. Sequence in context: A039414 A043237 A044017 * A325824 A163506 A226357 Adjacent sequences: A147648 A147649 A147650 * A147652 A147653 A147654 KEYWORD nonn,easy AUTHOR Paul Curtz, Nov 09 2008 EXTENSIONS More terms from Vincenzo Librandi, Nov 26 2010 STATUS approved

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Last modified June 19 03:10 EDT 2024. Contains 373492 sequences. (Running on oeis4.)