🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsРусскийالعربية中文日本語EntityQ547430· pop 19· linked from 242 articlesSierpinski numbernumber k which k*2^n+1 is composite with all nConnectionsprime numberEntitySpringer Science+Business MediaEntityCategoriesConjecturesPrime numbersScience and technology in PolandUnsolved problems in number theory