A NUMERICAL CURIOSITY
A Greek professor has discovered seven to be destructive. Writing for a Greek paper that appears in [Paris, he .produces a mathematical curiosity, which we reproduce from I the London Evening Standard. "The magic, figures are 142,857. If they the multiplied by two, the result is 285,714. That is, the same figures and the same sequence. Multiply by three and the figures (428571) and the sequence are still undisturbed. Multiplied by four, the result is 571,428. Here again the same figures and the same undisturbed sequence. Multiply by five, and the result is 714,285, by six 857,142. In this last example, because the two sets of three figures are cxactly transposed. "When, however, the doubtless weary figures are multiplied by seven, the magic formula breaks down, and the following curious result is achieved—999,999."
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Bay of Plenty Beacon, Volume 2, Issue 193, 31 July 1940, Page 3
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136A NUMERICAL CURIOSITY Bay of Plenty Beacon, Volume 2, Issue 193, 31 July 1940, Page 3
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