2^n-1&2^n&2^n+1 là 3 số tn liên iếp=>1số chia hết cho3. Mà 2^n không chia hết cho 3 =>2^n-phải chia hết cho 3 vì 2^n+1 là nguyên tô.
cho p la so nguyen to lon hon 3 chung minh rang p^2+2012 la hop so
ae jup minh voi
tap hop cac so nguyen n de \(\frac{n}{n+3}\)co gia tri la so nguyen la S = {...}
cho p la so nguyen to >3 . CMR :\(p^2+2012\)la hop so
GIUP MINH NHE .............!!!
Cho a, b, c, d la cac so nguyen duong thoa man a2+b2=b2+d2. CM a+b+c+d la hop so
cho p la phan so nguyen to lon hon 3
a) tim so du khi p binh phuong cho 3
b) hoi p binh phuong +2015 la so nguyen to hay hop so
Mot so nguyen to p chia cho 42 du r la hop so . Tinh hop so r
B1. Cho f(1)=1008,f(1)+f(2)+...+f(n)=n^2.f(n) f(n)la ham so duong
tinh f(2015)
B2 Cho cac so nguyen to q,p,r,s sao cho cac so sau deu la so nguyen to p^s+s^q,q^s+s^r,r^s+s^p
tim cac so p,q,r,s
B3 co a,b,c duong a mu 3+bmu3=c^3
so sanh a^2015+b^2015 va c^2015
Cho so nguyen to n co 2 chu so hang chuc la x, hang don vi la y. Biet M=n/x+y. Tim n de M=2. Tim n de M dat gia tri nho nhat
tim cac so nguyen n sao cho P=2n -1 / n-1 la so nguyen