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 A018038 Powers of cube root of 21 rounded up. 21
 1, 3, 8, 21, 58, 160, 441, 1217, 3357, 9261, 25551, 70492, 194481, 536559, 1480324, 4084101, 11267725, 31086799, 85766121, 236622225, 652822777, 1801088541, 4969066720, 13709278307, 37822859361, 104350401111, 287894844441, 794280046581, 2191358423330 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..200 MATHEMATICA Table[Ceiling[21^(n/3)], {n, 0, 40}] (* Vincenzo Librandi, Jan 10 2014 *) PROG (MAGMA) [Ceiling(21^(n/3)): n in [0..40]]; // Vincenzo Librandi, Jan 10 2014 CROSSREFS Cf. powers of cube root of k ceiling up: A017981 (k=2), A017984 (k=3), A017987 (k=4), A017990 (k=5), A017993 (k=6), A017996 (k=7), A018002 (k=9), A018005 (k=10), A018008 (k=11), A018011 (k=12), A018014 (k=13), A018017 (k=14), A018020 (k=15), A018023 (k=16), A018026 (k=17), A018029 (k=18), A018032 (k=19), A018035 (k=20), this sequence (k=21), A018041 (k=22), A018044 (k=23), A018047 (k=24). Sequence in context: A158495 A273720 A018037 * A000737 A192235 A148769 Adjacent sequences:  A018035 A018036 A018037 * A018039 A018040 A018041 KEYWORD nonn AUTHOR EXTENSIONS More terms from Vincenzo Librandi, Jan 10 2014 STATUS approved

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Last modified January 29 04:57 EST 2020. Contains 331335 sequences. (Running on oeis4.)