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A143663
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a(n) is the least prime such that the multiplicative order of 3 mod a(n) equals n, or a(n)=1 if such prime does not exist.
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2
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2, 1, 13, 5, 11, 7, 1093, 41, 757, 61, 23, 73, 797161, 547, 4561, 17, 1871, 19, 1597, 1181, 368089, 67, 47, 6481, 8951, 398581, 109, 29, 59, 31, 683, 21523361
(list; graph; refs; listen; history; internal format)
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