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A061661
Numbers k > 1 such that, in base 7, k and k^2 contain the same digits in the same proportion.
12
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
EXAMPLE
30 = 42_7 and 30^2 = 2424_7.
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