Legendre prime counting function: Difference between revisions
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→{{header|Mathematica}}/{{header|Wolfram Language}}
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Phi[x_, 0] := x
Phi[x_, a_] := Phi[x, a] = Phi[x, a - 1] - Phi[Floor[x/Prime[a]], a - 1]
pi[n_] := Module[{a}, If[n < 2,
Scan[Print[pi[10^#]] &, Range[0,9]]</lang>
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