cho P>5 la so nguyen to va 2P+1 cung la 1 so nguyen to Chung minh 4P+1 la hop so
cho 2p+1 va p la so nguyen to (p>3) chung minh rang 4p+1 la hop so
cho p la so nguyen to lon hon 3
a] chung to rang p 6k+1 hoac 6k+5
b] biet 8p +1 la so nguyen to chung minh 4p+1 la hop so
cho p va 2p+1 la so nguyen to (p>3).chung minh rang:4p+1 La hop so
Cho p va 2p+1 la cac so nguyen to (p>5).Hoi 4p+1 la so nguyen to hay hop so
Cho p la so nguyen to (p<3) va 2p+1 cung la so nguyen to . Hoi 4p+1 la so nguyen to hay hop so?Vi sao?
cho pva 8p➕1 la cac so nguyen to.
hoi8p➖1 la so nguyen to hay hop so
1.Tren nua mp bo chua tia Ox,ve cac tia Ox1,Ox2,Ox3,...,OxN sao cho:
xOx2=2xOx1,xOx3=3xOx1,.......,xOxN=NxOx1.tim so N nho nhat de trong cac tia da ve co mot tia la tia phan giac chung cua 2017 goc
2.CMR:neu p la so nguyen to lon hon 3 va 2p+1 cung la so nguyen to thi 4p+1 la hop so
3.So sanh: 63^15 va 34^18
4.tim cac so tu nhien n co hai chu so biet:2n+1 va 3n+1 deu la so chinh phuong
5.CMR: S=16^5+2^15 chia het cho 33
