Monday, February 24, 2014

1800

1800 = 2 x 2 x 2 x 3 x 3 x 5 x 5.

1800 is a pentagonal pyramidal number.

1800 is the sum of 10 consecutive primes: 1800 = 157 + 163 + 167 + 173 + 179 + 181 + 191 + 193 + 197 + 199.

1800 is 5151 in base 7. It is 800 in base 15.

1800 has two representations as a sum of two squares: 1800 = 62 + 422 = 302 + 302.

1800 divides 496 - 1.


Source: Prime Curios!

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