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    derp
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    n(n+1)/2
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    Yes, but I've forgotten it :L having only learnt it last week, which is stupid - I have a prelim on Monday :O
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    Would that not just be a sum between zero and the given number, then the formula for the sum of r [n/2(n+1)] be applied?
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    (Original post by Pheylan)
    yeah but is there a nice snappy word like 'factorial' for it?
    n'th triangular number. you could abbreviate it to something catchy (like n ****) but i don't know whether it would catch on.
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    (Original post by around)
    n(n-1)/2

    :p:

    +?
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    (Original post by Pheylan)
    TSR is the perfect place to create mathematics for the upcoming generation. what should we call it?
    There is a word behind the swear filter.
 
 
 
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