Chung minh rang tong 5 so tu nhien lien tiep khong the la so chinh phuong
cho a bang 2^2+2^3+...+2^20 chung minh rang A+4 khong phai la so chinh phuong
cho p la tich cua 2016 so nguyen to dau tien
chung minh rang p-1 va p+1 khong la so chinh phuong
Chung minh rang: 41^2015+2017^2016+2016^2017+8001^2018 khong phai la so chinh phuong
cho N=1.3.5.......2013 chung minh rang trong ba so tu nhien lien tiep 2N-1;2N;2N+1 khong co so nap la so chinh phuong
Cho N=1.3.5.7.....2015
Chungminh rang N-1; N+3 khong la so chinh phuong
Cho N =1x3x5x....x2013 .Chung minh rang trong ba so tu nhien lien tiep 2N-1;2N;2N+1 khong co so nao la so chinh phuong
cho A=2*3*5*7*9*......*Pn la tich cua aso nguyen to dau tien. Chung to rang 3 so A-1;A;A+1 KHONG CO SO NAO LA SO CHINH PHUONG
cho A = 2 + 22 + 23 + ... + 220 . chung minh rang A + 4 khong phai la so chinh phuong