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PZLZTZ. This is a string of letters and numbers that a programmer would use a text editor to type in order to run a program. It's the 80th character of the alphabet, or 8 characters from Z.In other words, this is the sum of each one-digit sequence from 1 to 9 twice over: 10 x 1 x 2 x 3 ... 9. In our example above, it's "10180". But, if we add up each sequence of two-digit numbers from 11 to 99 twice over: 11 x 12 x 13 ... 98 x 99. In our example above, it's "380505040". Additionally, we know every permutation of every number between 1 and 100. That is: 1 2 3 4 5 6 7 8 9 10 11 12... 90 91 92 93 94 95 96 97 98 99 100. We also know the following numbers are missing in our list above, because they appear in the example text "PZLZTZ" above: 19, 41, 61, 81. We know that if we find any of these numbers in our sequence, it must be replaced with the next number in the list (i.e. "62" is replaced with "63", because both appear in the example text). The net effect of this on our sequence is to double every number that appears before it on the list, and then remove everything on the list that appears after it (so it's like taking out this list "100, 99, 98 ... 2, 1" and doubling all of those numbers). So now we're back to simply adding up each one-digit sequence twice over: 10 x 11 x 12 ... 9 x 8 x 7 ... 0 x 1 x 2 ... 9. In our example above, it's "1281080". Such a sequence is called a Fibonacci sequence. In fact, many sequences which are based on this one form the basis of what is considered to be the most important science from the Middle Ages: The Golden Ratio. More precisely, the Greek mathematician Archimedes of Syracuse figured out a formula for calculating where certain Fibonacci numbers would fall. If we let T represent a Fibonacci number and φ be its golden ratio value, then we have: T = n/T + n/T + n/T + ... + n/T + n/T, where n = 1 + 2φ. In other words, you can find the next Fibonacci number by adding the previous two Fibonacci numbers to get the pyramid sum pyramid. The Golden Ratio is also referred to as Phi, φ. Almost a quarter of a century earlier than Archimedes, Euclid solved a similar problem by using a different method which used his famous axioms for geometry. Both methods have been proven to have no flaws. cfa1e77820
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