Count to a million

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year 253 Period of the Thirty Tyrants in the Roman empire.

[Samven]

254, a Texas telephone area code according to Wikipedia.

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year 255- Ma Jun, a Chinese mechanical engineer from Cao Wei, invents the South Pointing Chariot, a path-finding directional compass vehicle that uses a differential gear, not magnetics.

[Pherione]

http://256.com/256.html

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257 is called a sexy prime.

Since 257 + 2 = 259, a semiprime, 257 is a Chen prime. It is also an Eisenstein prime with no imaginary part, and a Pierpont prime.

[Samven]

258. Two-hundred and eight. It's an anagram of "eight-hundred and two".

; D

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two fifty nine

[MetalRenard]

260BC: Birth year of Zheng, who will later become the First Emperor of China (in 210 BC)

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The tesseract can be unfolded into eight cubes, just as the cube can be unfolded into six squares (view animation). An unfolding of a polytope is called a net. There are 261 distinct nets of the tesseract. The unfoldings of the tesseract can be counted by mapping the nets to paired trees (a tree together with a perfect matching in its complement).

[Samven]

One hundred times two, plus seventy-four, minus twelve equals 262. :D