🌐EnglishEnglishDeutschEspañolFrançaisItalianoPortuguêsTiếng ViệtРусскийالعربية中文日本語EntityQ2298723· pop 17safe primeprime number of the form 2p+1 where p is also primeAvailable in 17 languagesFrançaisDeutsch中文日本語РусскийItalianoالعربيةCzechDanishEsperantoFinnishCategoriesClasses of prime numbersTheory of cryptography