Powers of 2

Aquafina · #1 $Old$ November 2nd, 2009, 07:04 AM

1. Find a series of consecutive integers such that the sum of the series is a power of 2.

2. If every term in a sequence S is defined by the sum of every item before it, give a formula for the nth term.

If I start with the first 2 terms being 1, then the next ones are just powers of 2 aren't they?

wonderboy1953 · #2 $Old$ November 3rd, 2009, 11:34 AM

This seems to work:

(2) + 2 + 4 + 8 + 16 + 32 +...= powers of two, the only question is how to translate this into a formula.

wonderboy1953 · #3 $Old$ November 3rd, 2009, 12:06 PM

n(n + 1)/2