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Thu 14 Oct, 2004 04:27 pm
What is the next number in this sequence?
6, 28, 496, ?
Take the difference of the second and third number, divide by the difference in the first and second; that will give you "a" for the equation ax+b. Put the first number in as x and adjust b so the equation produces the second number, then throw the third number into the completed equation and grab a lemonade.
8128
These are perfect numbers.