The book is now available! 267
(another Prime Pages' Curiosity)
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+ 267 = pi(2)*phi(2)*sigma(2) + pi(6)*phi(6)*sigma(6) + pi(7)*phi(7)*sigma(7). Note that 267 is the only number with this property. [Firoozbakht]

(There are 2 curios for this number that have not yet been approved by an editor.)




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