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

1,1

Links

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

Example

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

Crossrefs

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

Sequence in context: A069965 A215627 A178672 * A042754 A215192 A244836

Adjacent sequences: A061658 A061659 A061660 * A061662 A061663 A061664

Keyword

base,easy,nonn

Author

Erich Friedman, Jun 16 2001

Extensions

More terms from Naohiro Nomoto, Oct 04 2001

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

Status

approved