p =2;5;7 vì 4.2+9=17 là SNT ; 4.5+9 = 29 là SNT ; 4.7+9=37 là SNT
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Tim cac so nguyen to p de 4p+9 la so nguyen to nho hon 40.
tim cac so nguyen to a de 4a +11 la so nguyen to nho hon 30
Tim so nguyen to a de 4a cong 11 la so nguyen to nho hon 30
hai cap so nguyen to hon kem nhau 2 don vi goi la cap so nguyen to sinh doi. tim cac cap so nguyen to sinh doi nho hon 100
Cho phan so a/35
a, tim so nguyen to a de a/35 rut gon duoc
b, Tim cac so a biet phan so do la phan so toi gian nho nhat hon 1
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
Ban nao dung minh se tich
Bai 1Tim nguyen to a de 4a+11 la so nguyen to nho hon 30
Bai 2 cac so sau la so nguyen to hay so hop so:
a=1*3*5*7*....*13+20
b=147*247*347-13
hai so nguyen to sinh doi la hai so nguyen to hon kem nhau 2 don vi .Tim hai so nguyen to sinh doi nho hon 50
Tim so nguyen to p de p, p+2, p+4 deu la cac so nguyen to