RosettaCodeData/Task/Totient-function/Sidef/totient-function-3.sidef

[100, 1_000, 10_000, 100_000].each {|limit|
    var pi = (1..limit -> count_by {|n| 𝜑(n) == (n-1) })
    say "Number of primes <= #{limit}: #{pi}"
}