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The Counting Thread

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    Originally posted by BrilloPad View Post
    you are a bit late.

    what is the fourth?
    http://en.wikipedia.org/wiki/Perfect_number

    Euclid discovered that the first four perfect numbers are generated by the formula 2n−1(2n − 1):

    for n = 2: 21(22 − 1) = 6
    for n = 3: 22(23 − 1) = 28
    for n = 5: 24(25 − 1) = 496
    for n = 7: 26(27 − 1) = 8128.

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      506

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        507

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          508

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            509

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              510

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                511

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                  512

                  number 217 today
                  Married

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                    513 - harshad number

                    514 - nontotient number

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                      515

                      If we get to 590 we would have doubled the post count in 1 day

                      gotta be a record
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