Let be the sum of the base- digits of , and the Thue-Morse sequence, then

Allouche, J.-P. "Series and Infinite Products Related to Binary Expansions of Integers." http://algo.inria.fr/seminars/sem92-93/allouche.ps.

Allouche, J.-P. and Cohen, H. "Dirichlet Series and Curious Infinite Products." Bull. London Math. Soc. 17, 531-538, 1985.

Shallit, J. O. "On Infinite Products Associated with Sums of Digits." J. Number Th. 21, 128-134, 1985.

CITE THIS AS:

Weisstein, Eric W. "Digit Product." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/DigitProduct.html