3 số nguyên tố đó là :
3;5;7
Vì: 32 + 52 + 72 = 83
83 là số nguyên tố
3 số nguyên tố đó là :
3;5;7
Vì: 32 + 52 + 72 = 83
83 là số nguyên tố
tim 3 so nguyen to lien tiep sao cho tong cac binh phuong cua cac so so do la 1 so nguyen to
Tim 4 so nguyen to lien tiep sao cho tong cua 4 so nguyen to do cung la 1 so nguyen to
tim tat ca cac so nguyen to sao cho tong binh phuong cua chung cung bang 1 so nuyen to
tim 4 so nguyen to lien tiep ma tong cua chung la 1 so nguyen to
tim 4 so nguyen to lien tiep sao cho tong 4 so do la so nguyen to
1. Tim tat ca cac so co 2 chu so sao cho moi so gap 2 lan tich cua no?
2. Tim so nguyen to co 3 chu so biet rang neu viet so do theo thu tu nguoc lai thi ta duc 1 so la lap phuong cua 1 so tu nhien?
3. Tim so tu nhien co 4 chu so biey chu so hang nghin bang chu so hang don vi chu so hang tram bang chu so hang chuc va so do viet duoc duoi dang tich cua 3 so nguyen to lien tiep?
Vi sao muon biet so tu nhien a co la so nguyen to hay khong ta lai lay cac so nguyen to P sao cho binh phuong cua no khong vuot qua a.
1) chung to rang tong cua 3 so nguyen lien tiep chia het cho 3
2) chung to rang tong cua 5 so nguyen lien tiep chia het cho 5
tim tap hop cac so co hai chu so la binh phuong cua 1 so nguyen to