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Date: 19-3-2020
734
Date: 11-11-2019
755
Date: 27-9-2020
1186
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A finite, increasing sequence of integers such that
A sequence is a Giuga sequence iff it satisfies
for , ..., . There are no Giuga sequences of length 2, one of length 3 (), two of length 4 ( and ), 3 of length 5 (, , and ), 17 of length 6, 27 of length 7, and hundreds of length 8. There are infinitely many Giuga sequences. It is possible to generate longer Giuga sequences from shorter ones satisfying certain properties.
REFERENCES:
Borwein, D.; Borwein, J. M.; Borwein, P. B.; and Girgensohn, R. "Giuga's Conjecture on Primality." Amer. Math. Monthly 103, 40-50, 1996.
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