An irrational decimal fraction is created by concatenating the positive integers:
0.123456789101112131415161718192021...
It can be seen that the 12th digit of the fractional part is 1. If dn represents the nth digit of the fractional part, find the value of the following expression:
d1 × d10 × d100 × d1000 × d10000 × d100000 × d1000000
Run this solution at repl.io
here.
# create the first one million decimal digits of
# champernowne's constant as a string
d = ''
n = 1
while len(d) < 1000000:
d = d + str(n)
n += 1
# multiply the select digits as requested
print(int(d[1-1]) * int(d[10-1]) * int(d[100-1]) \
* int(d[1000-1]) * int(d[10000-1]) * int(d[100000-1]) \
* int(d[1000000-1]))