28 digits of phi (Golden ratio)

#Python code to computer first 28 digits of golder ration (phi)

from decimal import*
def babylonian(m):
    n=m
    xn=2
    yn=3
    error=Decimal(10**(-323))
    #print error
    while abs(yn-xn)>error:
        xn=Decimal(yn)
        yn=Decimal((xn+n/xn)/2)
    return Decimal(yn)
print (1+babylonian(5))/2       

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