base = 10
c1 = 0
c2 = 0
for k = 1 to (base ^ 2) - 1
    c1 = c1 + 1
    if k mod (base - 1) = (k * k) mod (base - 1) then c2 = c2 + 1: print k; " ";
next k
print
print "Trying "; using("##", c2); " numbers instead of "; using("###", c1);  " numbers saves "; using("##.##", (100 - (100 * c2 / c1))); "%"
end