RosettaCodeData/Task/Mertens-function/Run-BASIC/mertens-function.basic

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dim M(1000)
M(1) = 1
for n = 2 to 1000
M(n) = 1
for k = 2 to n
M(n) = M(n)-M(int(n/k))
next k
next n
print "First 99 Mertens numbers:"
print " ";
for n = 1 to 99
print using("###", M(n));
if n mod 10 = 9 then print
next n
numCruza = 0
numEsCero = 0
for n = 1 to 1000
if M(n) = 0 then
numEsCero = numEsCero +1
if M(n-1) <> 0 then numCruza = numCruza +1
end if
next n
print
print "M(n) is zero "; numEsCero; " times."
print "M(n) crosses zero "; numCruza; " times."