login
Numbers whose cubes have an odd number of digits.
4

%I #8 Jan 02 2023 12:30:53

%S 0,1,2,5,6,7,8,9,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,

%T 39,40,41,42,43,44,45,46,100,101,102,103,104,105,106,107,108,109,110,

%U 111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126

%N Numbers whose cubes have an odd number of digits.

%C The sequence of cubes starts: 0, 1, 8, 125, 216, 343, 512, 729, 10648, 12167, 13824, ...

%H Lars Blomberg, <a href="/A288659/b288659.txt">Table of n, a(n) for n = 1..10000</a>

%H Jeremy Gardiner, <a href="http://list.seqfan.eu/oldermail/seqfan/2016-December/017135.html">Middle digit in square numbers</a>, Seqfan Mailing list, Dec 12 2016.

%t Join[{0},Select[Range[200],OddQ[IntegerLength[#^3]]&]] (* _Harvey P. Dale_, Oct 24 2017 *)

%Y Cf. A288657, A288658, A288660.

%K nonn,base,easy

%O 1,3

%A _Lars Blomberg_, Jun 13 2017