A018117 Powers of fifth root of 2 rounded down.

1, 1, 1, 1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 6, 6, 8, 9, 10, 12, 13, 16, 18, 21, 24, 27, 32, 36, 42, 48, 55, 64, 73, 84, 97, 111, 128, 147, 168, 194, 222, 256, 294, 337, 388, 445, 512, 588, 675, 776, 891, 1024, 1176, 1351, 1552, 1782, 2048, 2352, 2702, 3104, 3565, 4096

Offset

0,6

Links

Amiram Eldar, Table of n, a(n) for n = 0..1000

Mathematica

a[n_] := Floor[2^(n/5)]; Array[a, 100, 0] (* Amiram Eldar, Apr 04 2025 *)

Prog

(PARI) a(n) = sqrtnint(2^n, 5) \\ Amiram Eldar, Apr 04 2025

Crossrefs

Cf. A017910, A017979, A018048.

Sequence in context: A060970 A035429 A280169 * A086936 A214129 A280151

Adjacent sequences: A018114 A018115 A018116 * A018118 A018119 A018120

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved