Binary 11.00100100001111110110…[1]
Decimal 3.14159265358979323846264338327950288…
Hexadecimal 3.243F6A8885A308D31319…[2]
Rational approximations 3, 22⁄7, 333⁄106, 355⁄113, 103993/33102, ...[3]
(listed in order of increasing accuracy)