Friday, October 24, 2008

1849

1849 = 432, a perfect square.


1849 is a perfect power in which neighboring digits are distinct.

1849 is a powerful number whose digit reversal is a semiprime: 9481 = 19 x 499.


Felix Klein (1849–1925) was born on April 25, 1849 (4/25/1849). Klein took particular delight in pointing out that each of the day (52), month (22), and year (432) is the square of a prime number.


Source:
The MacTutor History of Mathematics Archive
Image:
Portrait Gallery
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