Solutions to specific examples of the Pell equation, such as the Pell numbers arising from the equation with "n" = 2, had been known for much longer, since the time of Pythagoras in Greece and to a similar date in India.
304-308, 1925== Zunanje povezave ==* Burnt City Video, part 1 of 4 - Youtube* Burnt City Video, part 2 of 4 - Youtube* Burnt City Video, part 3 of 4 - Youtube* Burnt City Video, part 4 of 4 - Youtube* Shahr-e Sukhteh, CHN* Burnt City Inhabitants Used Teeth for Basket Weaving, CHN* World's Oldest Backgammon Set found at the Burnt City