π(x) 0.001 prime counting function | Desmos

Expression 1: "y" equals Start sum from "k" equals 3.5 to "x" minus 0.5, end sum, left parenthesis, left parenthesis, negative 2 plus "k" , right parenthesis ! minus "k" left parenthesis, floor left parenthesis, StartFraction, left parenthesis, negative 2 plus "k" , right parenthesis ! Over "k" , EndFraction , right parenthesis , right parenthesis , right parenthesis left brace, 23 greater than "x" greater than 4 , right brace

1

Expression 2:

2

3

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