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A080535
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Number of protons in longest known radioactive decay series ending with Lead 208 ("thorium series"), reversed.
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5
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82, 81, 83, 82, 84, 86, 88, 87, 89, 88, 90, 92, 94, 96, 98, 100, 101, 103, 105, 107, 109, 111
(list; graph; refs; listen; history; internal format)
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