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Powers of cube root of 4 rounded down.
21

%I #12 Sep 08 2022 08:44:44

%S 1,1,2,4,6,10,16,25,40,64,101,161,256,406,645,1024,1625,2580,4096,

%T 6501,10321,16384,26007,41285,65536,104031,165140,262144,416127,

%U 660561,1048576,1664510,2642245,4194304,6658042,10568983,16777216,26632170,42275935,67108864

%N Powers of cube root of 4 rounded down.

%H Vincenzo Librandi, <a href="/A017985/b017985.txt">Table of n, a(n) for n = 0..200</a>

%F a(n) = floor(4^(n/3)). - _Wesley Ivan Hurt_, Sep 04 2022

%t Table[Floor[4^(n/3)], {n, 0, 40}] (* _Vincenzo Librandi_, Jan 06 2014 *)

%o (Magma) [Floor(4^(n/3)): n in [0..50]]; // _Vincenzo Librandi_, Jan 06 2014

%Y Cf. sequences of the type: Powers of cube root of (k) rounded down A017979 (k=2), A017982 (k=3), this sequence (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), A018036 (k=21), A018039 (k=22), A018042 (k=23), A018045 (k=24).

%K nonn

%O 0,3

%A _N. J. A. Sloane_.

%E More terms from _Vincenzo Librandi_, Jan 06 2014