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Each new Mersenne
prime 2n-1 contributes another layer
with n bricks written in binary added to the wall
to the right. The first few Mersenne primes are
22-1, 23-1, 25-1,
27-1 and 2, 3, 5, 7 written in binary
becomes 10, 11, 101, 111 which are the first four
layers from the left. The drawing was made in 1982
when only 28 Mersenne primes were known, the biggest
then being 286243-1, discovered by Slowinski's
CRAY. The current wall records all known Mersenne
primes.
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