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Math Help - Sequences

  1. #1
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    Sequences

    Hi Guys, I desperately need to know if there is a simple formula for the following set of numbers.
    3
    7
    12
    18
    25
    33
    42 etc

    You can see that the number by which it increses is 1 extra each time but I need to know how to but this into a formula.

    Thanks,

    Mark
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  2. #2
    MHF Contributor

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    Quote Originally Posted by Berwick View Post
    Hi Guys, I desperately need to know if there is a simple formula for the following set of numbers.
    3
    7
    12
    18
    25
    33
    42 etc
    \frac{n(n+5)}{2}
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