Thursday, July 17, 2014

8420

8420 = 2 x 2 x 5 x 421.

8420 is the number of symmetric ways to fold a strip of 20 stamps (A001010).

8420 = 203 + 202 + 20 (A027444 and A063012).

8420 has two representations as a sum of two squares: 8420 = 262 + 882 = 322 + 862.

8420 divides 294 - 1.


Source: What's Special About This Number?

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