Question Number 48524 by Pk1167156@gmail.com last updated on 25/Nov/18
$$\mathrm{Prime}\:\mathrm{numbers}\:\mathrm{differing}\:\mathrm{by}\:\mathrm{2}\:\mathrm{are} \\ $$$$\mathrm{called}\:\_\_\_\_\_. \\ $$
Prime-numbers-differing-by-2-are-called-