Count to a million

[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

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263 is an irregular prime, an Eisenstein prime, a long prime, a Chen prime, a Gaussian prime, a happy prime, a sexy prime, a safe prime, and a Higgs prime.

263 bcThe Athenians and Spartans, worn down by several years of war and the devastation of their lands, make peace with Antigonus II of Macedonia who thus retains his hold on Greece.