A Field Guide to the Stars and Planets (2000)

by Jay M Pasachoff
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2. Trees

by T. H. Merrett, I. Prefatory Notes
"... 1. Powers. Teacher, invite your grade scholar to check and extend the following calculations. Start with n = 1 and work up. When that is secure, work down from n = 1. Point out that sums of powers of two are powers of two minus 1, and are called Mersenne numbers. n 0 1 2 3 4 5.. ..."
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1. Powers. Teacher, invite your grade scholar to check and extend the following calculations. Start with n = 1 and work up. When that is secure, work down from n = 1. Point out that sums of powers of two are powers of two minus 1, and are called Mersenne numbers. n 0 1 2 3 4 5..