Forbidden numbers: Difference between revisions
julia example
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Forbidden number count up to 500000: 83331
</pre>
=={{header|Julia}}==
{{trans|Python}}
<syntaxhighlight lang ="python">""" true if num is a forbidden number """
function isforbidden(num)
fours, pow4 = num, 0
while fours > 1 && fours % 4 == 0
fours ÷= 4
pow4 += 1
end
return (num ÷ 4^pow4) % 8 == 7
end
const f500M = filter(isforbidden, 1:500_000_000)
for (idx, fbd) in enumerate(f500M[begin:begin+49])
print(lpad(fbd, 4), idx % 10 == 0 ? '\n' : "")
end
for fbmax in [500, 5000, 50_000, 500_000]
println("\nThere are $(sum(x <= fbmax for x in f500M)) forbidden numbers <= $fbmax.")
end
</syntaxhighlight>{{out}} Same as Python.
=={{header|Nim}}==
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