Question about Computers & Internet
Posted by Anonymous on
It is a number of dots which can form an equilateral triangle when so arranged. So these numbers are 1 (trivial), 3, 6, 10, 15, 21, ....n(n+1)/2 where n is the n'th triangle number eg the 4th triangle number is 4(5)/2 = 10 as above
Posted on Apr 23, 2014
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Posted on Jan 02, 2017
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