...problems.

Do all four for extra credit, but make sure you indicate which one you want to count as ``extra''.

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...primes.

Recall that ``7#7'' denotes a product just as ``8#8'' denotes a sum.

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...primes?

Recall that the series 9#9 diverges.

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...15#15?

At first Bo thought that (33.50) required the assumption for the Chinese remainder theorem to apply, but then he decided that (33.50) would hold for any p that divided n.

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