A061661 Numbers k > 1 such that, in base 7, k and k^2 contain the same digits in the same proportion.

30, 210, 1470, 10290, 10652, 11636, 53544, 53730, 59130, 64896, 72030, 74564, 81452, 93510, 94356, 94400, 97038, 113754, 348540, 364016, 374808, 375204, 376110, 378642, 413910, 420848, 454272, 476352, 479642, 483428, 485460, 488232, 503648, 504210, 516302

Offset: 1

Author

Erich Friedman, Jun 16 2001

Keywords

• base
• easy
• nonn

Examples

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

Links

• Ray Chandler, Table of n, a(n) for n = 1..1000

Crossrefs

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

Extensions

More terms from Naohiro Nomoto, Oct 04 2001

Offset changed to 1 by Alois P. Heinz, May 10 2015