Các câu hỏi tương tự
tim stn n khac 0 sao cho : 1!+2!+3!+....+n! la 1 so chinh phuong
tim tat ca cac stn n sao cho ( 3n + 1 ) la 1 so chinh phuong
tim so tu nhien lon hon 0 sao cho tong
1!+2!+...+n! la so chinh phuong
b)tim 1 so co 4 chu so sao cho so do vua la s chinh phuong vua la so lap phuong
tim cac stn n de Q=1!+2!+3!+....+n! la mot so chinh phuong.
tim so nguyen to ab co 2 chu so khac nhau sao cho ba cung la 1 so nguyen to va ab - ba la 1 so chinh phuong
1+3+5+.......+(2n-1) , n thoc so tu nhien khac 0 . n co phai la so chinh phuong khong
Tim stn n có 2 chu so sao cho 2n la binh phuong cua 1 stn,3n la lap phuong cua mot stn
tim so tu nhien khac 0nho nhat sao cho tong 19 so tu nhien lien tiep:k+1;k+2;...:k+19 la 1 so chinh phuong
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