mersenneforum.org just an intermediate arithmetic sum
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 2017-05-08, 02:32 #1 MattcAnderson     "Matthew Anderson" Dec 2010 Oregon, USA 25616 Posts just an intermediate arithmetic sum Hi Mersenneforum, The trick for adding consecutive numbers in a series can be to pair up the largest and the smallest then pair up the next largest and smallest and then you either have one left in the middle or you don't So the sum of the counting numbers from 1 to r is r times the quantity r+1 all over 2. To compress we have r(r+1)/2 This expression is well known by those that well know it. Regards, Matt

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