a, Chung minh rang 5m+3 va 3m+2 la 2 so nguyen biet rang 1 so bang 10 ngen to cung nhau voi m la so nguyen to bat ky.
b,Tim 1 bo ba so nguyen to biet rang 1 so bang 10 phan tram tong cua 3 so can tim
Ai lam nhanh nhat minh tick cho
Tim so tunhien m de 7m la so nguyen to.
Tim so nguyen to p de p cong 10 va p cong 20 cung la so nguyen to
tim so nguyen to p sao cho:
a,p+2 va p+4 la so nguyen to
b,p+2 va p+6 va p+8 la so nguyen to
c,p+10 va p+14 la so nguyen to
Tim so nguyen to p sao cho cac so sau cung la cac so nguyen to :
a) p + 10 va p + 20
b)p+14 va p + 20
tim so nguyen to p sao cho p + 10 va p + 14 cung la nguyen to . ket qua p =
Biet rang 3n cong 1 va 5n cong 4 (n thuoc N ) la 2 so khong nguyen to cung nhau . Tim UCLN cua 2 so tren
tim so nguyen to p sao cho p+8 va p+10 la so nguyen to
Tim so nguyen to p biet :8p-1 va 8p+1deu la so nguyen to