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A066807
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Integers of the form (2^k+1)/k.
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0
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3, 3, 57, 4971027, 29850020237398251227313, 17503832475167772961878049926333027042428946479619, 58167804601757508792865761341330650726830745576152064464908846133090363
(list; graph; refs; listen; history; internal format)
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