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1950 - PXP
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== Cerinţa == Se dă un şir format din '''N''' numere naturale nenule. Spunem că un număr e fericit dacă se poate scrie ca suma pătratelor a două numere naturale. Notăm cu '''K''' numărul numerelor fericite din şir şi cu '''P''' produsul acestora. Aflaţi numărul '''K''' precum şi două numere naturale care au suma pătratelor egală cu '''PE''', unde '''E''' este un număr natural dat.
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