vì 691 k là số nguyên tố mà 691 là số nguyên tố nên k =1
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Biet rang so 691 . k la mot so nguyen to .Vay k bang ?
Mot so nguyen to khi chia cho 30 co so du la r.tim r biet rang r khong la so nguyen to?
cho 26 so nguyen,trong do tong cua 5 so bat ki la mot so nguyen duong.chung to rang tong cua 26 so nguyen da ch la mot so nguyen duong.
a, Chung minh rang 5m+3 va 3m+2 la 2 so nguyen biet rang 1 so bang 10 ngen to cung nhau voi m la so nguyen to bat ky.
b,Tim 1 bo ba so nguyen to biet rang 1 so bang 10 phan tram tong cua 3 so can tim
Ai lam nhanh nhat minh tick cho
Cho p la so nguyen to lon hon 3. Biet rang p+2 cung la so nguyen to. Chung minh rang p+1 chia het cho 6.
1) Mot so nguyen to chia cho 30 duoc so du la r.Tim r,biet r khong phai la so nguyen to.
2) Chung minh rang:
a/ So 17 khong viet duoc tong 3 hop so khong bang nhau.
b/Moi so le lon hon 17 deu viet duoc duoi dang 3 hop so khac nhau.
cho 16 so nguyen trong do tich cua 3 o bat ky luon la mot so nguyen am. chung to rang tich cua 16 so nguyen do la mot so nguyen duong
minh can gap!
biet rang 2 so nguyen to hon kem nhau 2 don vi duoc goi la 2 so nguyen to sing doi
chung to rang : 1 so nguyen to >5 nam giua 2 so nguyen to sing doi thi so do chia het cho 6
tim so nguyen to p biet rang:
a) p+94 , p+1994 la so nguyen to
b) p^2+4 va p^2-4 deu la so nguyen to