An irrational decimal fraction is created by concatenating the positive integers:
0.12345678901112131415161718192021...
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 x d10 x d100 x d1000 x d10000 x d100000 x d1000000