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A277289
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Positive integers n such that n | (3^n + 7).
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9
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1, 2, 4, 5, 8, 25, 44, 4664, 6568, 1353025, 2919526, 5709589, 7827725, 64661225, 85132756, 153872408, 743947534, 34304296003, 38832409867, 40263727492, 1946603375348, 2469908330348, 64471909888247, 274267749806485, 888906849689897, 896501949422459
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OFFSET
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1,2
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COMMENTS
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492385451091805616444 is a term.
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LINKS
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EXAMPLE
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3^25 + 7 = 847288609450 = 25 * 33891544378, so 25 is a term.
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PROG
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(PARI) is(n)=Mod(3, n)^n==-7; \\ Joerg Arndt, Oct 09 2016
(Python) A277289_list = [1, 2, 4, 5]+[n for n in range(6, 10**6) if pow(3, n, n)==n-7] # Chai Wah Wu, Oct 12 2016
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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