Armstrong numbers

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Oct 10, 2025, 12:18:24 PM (5 days ago) Oct 10

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Has anyone knowledge of proof, or explanation for, the fact that all Armstrong numbers > 9 are composite?

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Oct 10, 2025, 2:53:28 PM (5 days ago) Oct 10

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(] +/@:^ #) 10 #. inv 28116440335967x

28116440335967

this number seems prime.

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