approximations of π include

• Integers: 3
• Fractions: Approximate fractions include (in order of increasing accuracy) 227, 333106, 355113, 5216316604, 10399333102, and 24585092278256779. (List is selected terms from A063674 and A063673.)
• Decimal: The first 50 decimal digits are 3.14159265358979323846264338327950288419716939937510… (see A000796)
• Binary: The base 2 approximation to 48 digits is 11.001001000011111101101010100010001000010110100011… (see A004601)
• Hexadecimal: The base 16 approximation to 20 digits is 3.243F6A8885A308D31319… (see A062964)
• Sexagesimal: A base 60 approximation to five sexagesimal digits is 3;8,29,44,0,47 (see A060707)