RosettaCodeData/Task/M-bius-function/BASIC256/m-bius-function.basic

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function mobius(n)
if n = 1 then return 1
for d = 2 to int(sqr(n))
if n mod d = 0 then
if n mod (d*d) = 0 then return 0
return -mobius(n/d)
end if
next d
return -1
end function
outstr$ = " . "
for i = 1 to 200
if mobius(i) >= 0 then outstr$ += " "
outstr$ += string(mobius(i)) + " "
if i mod 10 = 9 then
print outstr$
outstr$ = ""
end if
next i
end