clc;clear;
m=0;
for n=100:999
if n/21==round(n/21)
m=m+1;
k(m)=n;
else
end
end
k,m
运行结果：
k =
Columns 1 through 17
105 126 147 168 189 210 231 252 273 294 315 336 357 378 399 420 441
Columns 18 through 34
462 483 504 525 546 567 588 609 630 651 672 693 714 735 756 777 798
Columns 35 through 43
819 840 861 882 903 924 945 966 987
m =
43