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Saturday, 11 july 2009

Numere prime!!!

Proposed by matchlessOffline
(15 comments)5.963 times displayed

Numărul 2 este prim, dar 12, 22, 32, 42, 52, ... , 92 nu sunt prime.
La fel, 5 este prim, dar 15, 25, 35, 45, ..., 95 nu sunt numere prime.

Care este următorul număr prim Y, cu proprietatea că nici unul din numerele 1Y, 2Y, ..., 9Y nu este prim ?


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