tim tat ca cac so nguyen duong x,y sao cho cac so x2+3.y va y2+3.x deu la so chinh phuong cua 1 so
neu co so tu nhien n sao cho k =n^2 thi ta noi so k la so chinh phuong tim tat ca cac so ab saocho (ab+ba) la so chinh phuong
tim tat ca cac stn n sao cho ( 3n + 1 ) la 1 so chinh phuong
tim tat ca cac so nguyen to sao cho tong binh phuong cua chung cung bang 1 so nuyen to
Tim tat ca cac so nguyen to p va q sao cho so 7p+q va pq+11 cung la cac so nguyen to
Tim tat ca cac so nguyen to p sao cho p+2 va p+28 cung la so nguyen to
tim tat ca cac so nguyen to p va q sao cho : 7p+q va pq+11 cung la so nguyen to
tim tat ca cac so nguyen to P sao cho 2p + p2 cung la so nguyen to
Tim tat ca cac so nguyen to p va q sao cho so 7p+q va pq+11 cung la cac so nguyen to
Tim tat ca cac so nguyen to p va q sao cho so 7p+q va pq+11 cung la cac so nguyen to
