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We give a simple proof of when is an odd primitiv quadratic Dirichlet character of conductor . In particular we do not use the Dirichlet class-number formula.
Prvočísla a otázky s nimi spojené představují často jedny z nejtěžších problémů matematiky a mnohé z nich zůstávají stále otevřené. V tomto článku se zabýváme otázkou, jak blízko ke zvolenému číslu již můžeme nalézt nějaké prvočíslo. Na základě známých tvrzení lze vyslovit hypotézu, že z každého přirozeného čísla lze již změnou nejvýše dvou číslic získat prvočíslo. Úvahy, kterými rozvíjíme známé výsledky, jsou čistě aritmetické povahy. Vyslovená hypotéza, která je závislá na hypotéze z (Hanson,...
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