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For any prime number p except 2 and 5, either Fp-1 or fp+1 is divisible by p. If I showed that this is true for p=7, the answer should be F8---is this correct because f8 is 21.
P=11 would be divisible by 55 which is F10.
13 years ago

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Steve
Looks good.
13 years ago

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