A018036 Powers of cube root of 21 rounded down.

1, 2, 7, 21, 57, 159, 441, 1216, 3356, 9261, 25550, 70491, 194481, 536558, 1480323, 4084101, 11267724, 31086798, 85766121, 236622224, 652822776, 1801088541, 4969066719, 13709278306, 37822859361, 104350401110, 287894844440, 794280046581, 2191358423329

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..200

Mathematica

Table[Floor[21^(n/3)], {n, 0, 40}]  (* Vincenzo Librandi, Jan 06 2014 *)

Prog

(Magma) [Floor(21^(n/3)): n in [0..40]]; // Vincenzo Librandi, Jan 06 2014

Crossrefs

Cf. powers of cube root of k rounded down: A017979 (k=2), A017982 (k=3), A017985 (k=4), A017988 (k=5), A017991 (k=6), A017994 (k=7), A018000 (k=9), A018003 (k=10), A018006 (k=11), A018009 (k=12), A018012 (k=13), A018015 (k=14), A018018 (k=15), A018021 (k=16), A018024 (k=17), A018027 (k=18), A018030 (k=19), A018033 (k=20), this sequence (k=21), A018039 (k=22), A018042 (k=23), A018045 (k=24).

Sequence in context: A246861 A305601 A202027 * A007050 A320811 A005666

Adjacent sequences: A018033 A018034 A018035 * A018037 A018038 A018039

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Vincenzo Librandi, Jan 06 2014

Status

approved