perfect number

[kopend]

why is 6 a perfect number

[ageing fast]

see
http://mathworld.wolfram.com/PerfectNumber.htm l

6 is the sum of its divisors so 6= 1+2+3

[kopend]

thanks for that
do you know why it is not known if thier is an odd perfect number?

[Fibonacci]

see
http://mathworld.wolfram.com/OddPerfectNumber. html
or
http://www.primepuzzles.net/puzzles/puzz_111.h tm

[ageing fast]

see
http://mathworld.wolfram.com/OddPerfectNumber. html

No-one has proved that there is no odd perfect number - so theoretically there could be one although, as you will see from the web-page, it would have to be enormous. The search continues - as humans never give up until proof is definitive!