login
Numbers k > 1 such that, in base 7, k and k^2 contain the same digits in the same proportion.
12

%I #12 Aug 25 2023 00:58:29

%S 30,210,1470,10290,10652,11636,53544,53730,59130,64896,72030,74564,

%T 81452,93510,94356,94400,97038,113754,348540,364016,374808,375204,

%U 376110,378642,413910,420848,454272,476352,479642,483428,485460,488232,503648,504210,516302

%N Numbers k > 1 such that, in base 7, k and k^2 contain the same digits in the same proportion.

%H Ray Chandler, <a href="/A061661/b061661.txt">Table of n, a(n) for n = 1..1000</a>

%e 30 = 42_7 and 30^2 = 2424_7.

%Y Cf. A061656, A061657, A061658, A061659, A061660, A061662, A061663, A114258, A061664.

%K base,easy,nonn

%O 1,1

%A _Erich Friedman_, Jun 16 2001

%E More terms from _Naohiro Nomoto_, Oct 04 2001

%E Offset changed to 1 by _Alois P. Heinz_, May 10 2015