A018035 Powers of cube root of 20 rounded up.

1, 3, 8, 20, 55, 148, 400, 1086, 2948, 8000, 21716, 58945, 160000, 434307, 1178891, 3200000, 8686137, 23577802, 64000000, 173722728, 471556032, 1280000000, 3474454550, 9431120637, 25600000000, 69489090985, 188622412731, 512000000000, 1389781819697

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn

Links

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

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), this sequence (k=20), A018038 (k=21), A018041 (k=22), A018044 (k=23), A018047 (k=24).

Programs

Magma

[Ceiling(20^(n/3)): n in [0..40]]; // Vincenzo Librandi, Jan 10 2014

Mathematica

With[{c=20^(1/3)}, Ceiling[c^Range[0, 30]]] (* Harvey P. Dale, Apr 07 2012 *)
Table[Ceiling[20^(n/3)], {n, 0, 40}] (* Vincenzo Librandi, Jan 10 2014 *)
Ceiling[CubeRoot[20]^Range[0,40]] (* Harvey P. Dale, Feb 12 2023 *)

Extensions

More terms from Vincenzo Librandi, Jan 10 2014