"The problem of distinguishing prime numbers from composite numbers and of resolving the latter into their prime factors is known to be one of the most important and useful in arithmetic." Carl Friedrich Gauss

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Time since the building of Great Wall of China

Time since the building of Great Wall of China (1,800 y)

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Neat Ratios ...

Time since the building of Great Wall of China (1,800 y)

  • is 2/5 of Time since building of the Great Pyramid of Giza / Cheops / Khufu (4,580 y)...more
  • is about as big as Time since the birth of Diophantus (1,814 y)...more
  • is 2 x Time since building of Angkor Wat (905 y)...more
  • is 2 x Time since the birth of Ibn Rushd (Averroes) (898 y)...more
  • is 4 x Time since the birth of Galileo (457 y)...more
  • is 10 x Time since the birth of Cantor (179 y)...more

If this was a standard unit ...