Monday, October 1, 2012

403

403 = 13 x 31. It is the smallest semiprime whose factors form a pair of emirps (13 and 31).

403 is 110010011 in base 2.

403 has a unique representation as a sum of three squares: 403 = 32 + 132 + 152.

403 is a heptagonal number.

403 = 23 + 33 + 33 + 53 + 63.


Source: Prime Curios!

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