Project Euler/40

Champernowne's Constant

Problem Statement

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

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle 0.12345678910{\color{red}\mathbf 1}112131415161718192021\cdots}

It can be seen that the 12th digit of the fractional part is 1

If Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle d_n} represents the nth digit of the fractional part, find the value of the following expression.

$d_{1}\times d_{10}\times d_{100}\times d_{1000}\times d_{10000}\times d_{100000}\times d_{1000000}$

Solution

Project Euler/40/Solution