|
%I #11 Sep 08 2022 08:44:44
%S 1,2,7,21,57,159,441,1216,3356,9261,25550,70491,194481,536558,1480323,
%T 4084101,11267724,31086798,85766121,236622224,652822776,1801088541,
%U 4969066719,13709278306,37822859361,104350401110,287894844440,794280046581,2191358423329
%N Powers of cube root of 21 rounded down.
%H Vincenzo Librandi, <a href="/A018036/b018036.txt">Table of n, a(n) for n = 0..200</a>
%t Table[Floor[21^(n/3)], {n, 0, 40}] (* _Vincenzo Librandi_, Jan 06 2014 *)
%o (Magma) [Floor(21^(n/3)): n in [0..40]]; // _Vincenzo Librandi_, Jan 06 2014
%Y 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).
%K nonn
%O 0,2
%A _N. J. A. Sloane_
%E More terms from _Vincenzo Librandi_, Jan 06 2014
|
