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A080533
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Number of protons in longest known radioactive decay series ending with Lead 206 ("uranium series"), reversed.
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5
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82, 81, 80, 82, 81, 83, 82, 84, 86, 88, 90, 92, 94, 96, 97, 99, 101, 103, 105, 107, 109
(list; graph; refs; listen; history; internal format)
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