#(2^((2^(43-1))-1))*(2-(2^-16340))
from decimal import *
getcontext().prec = 100
from decimal import localcontext
with localcontext() as ctx:
    print(ctx.Emax) # デフォルトの指数上限は999999なので、今回の計算だと足りない
    ctx.Emax = 9999999999999 # 指数上限を増やす
    s = ctx.power(2,4398046511103)
    print(s)
    w = ctx.power(2,-16340)
    print(w)
    t = (s * 2 - s * w)
    print(t)
    #必要に応じて有効桁を調整する
    format_str = "{:.1e}".format(t)
    print(format_str)

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