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Template:當代數學 者,整數也。其前接者為,後續者為。可書

七者,質數之第四也。其前接者為,後續者為十一

  • 七者,第二孿生質數之一也,曰(五、七)。
  • 七者,階乘質數之第四也。(三之階乘加一為七,記曰3!+1=7

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