A018038 Powers of cube root of 21 rounded up.

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

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: A349186 A273720 A018037 * A000737 A371891 A192235

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