A018104 Powers of fourth root of 20 rounded up.

1, 3, 5, 10, 20, 43, 90, 190, 400, 846, 1789, 3783, 8000, 16918, 35778, 75660, 160000, 338359, 715542, 1513187, 3200000, 6767177, 14310836, 30263732, 64000000, 135343522, 286216702, 605274630, 1280000000

Offset

0,2

Links

Table of n, a(n) for n=0..28.

Formula

a(n) = ceiling(20^(n/4)). - Wesley Ivan Hurt, Jun 22 2022

Mathematica

Ceiling[20^(Range[0, 30]/4)] (* Wesley Ivan Hurt, Jun 22 2022 *)

Crossrefs

Cf. A011016, A018102, A018103.

Sequence in context: A342762 A270737 A270724 * A134365 A076862 A107129

Adjacent sequences: A018101 A018102 A018103 * A018105 A018106 A018107

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved