Problem 40 : Champernowne's constant

Problem Statement

An irrational decimal fraction is created by concatenating the positive integers:

0.123456789101112131415161718192021…

It can be seen that the 12^th 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 × d_1000000

Solution

number=""
for i in range(1,10**6+1):
    number=number+str(i)

r =int(number[1-1]) * int(number[10-1]) * int(number[100-1]) * int(number[1000-1]) *
 int(number[10000-1]) * int(number[100000-1]) * int(number[1000000-1])

print(r)

Output

210