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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

N. J. A. Sloane.

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.)