Thread: On The Square
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Old 16-07-2014, 09:38 PM   #160
lightgiver
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Lightbulb Square triangular number


Quote:
In mathematics, a square triangular number (or triangular square number) is a number which is both a triangular number and a perfect square..In 1778 Leonhard Euler determined the explicit formula..The problem of finding square triangular numbers reduces to Pell's equation..Euler was featured on the sixth series of the Swiss 10-franc banknote and on numerous Swiss, German, and Russian postage stamps.. He is also commemorated by the Lutheran Church on their Calendar of Saints on 24 May – he was a devout Christian (and believer in biblical inerrancy) who wrote apologetics and argued forcefully against the prominent atheists of his time..The asteroid 2002 Euler was named after him...
http://en.wikipedia.org/wiki/Square_triangular_number
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