chung to 2n+1 va 6n+3 la 2 so ngyen to cung nhau
2n + 1 va 6n + 5 la 2 so nguyen to cung nhau
voi n thuoc N chung to 2 so sau nguyen to cung nhau
6n + 5 va 2n + 3
Chung to rang cac so sau la cac so nguyen to cung nhau :
1) 2n + 1 và 2n + 3
2) 2n + 5 va 3n + 7
chung to rang hai so n + 1 va 2n + 3 la hai so nguyen to cung nhau
chung minh rang n+1 va 2n+3 la 2 so nguyen to cung nhau
chung to rang 2n + 1 va 2n + 3 ( n\(\in\)N ) la 2 so nguyen to cung nhau
chung minh rang so 2n+1 va 6n+5 nguyen to cung nhau voi moi so tu nhien n
chung to 2 so sau la 2 so nguyen to cung nhau
a,2n+3 va n+2
b,3n+1va 2n+1
c,n+10 va n+11