Tag Archives: digit

Iterating squared digit sums in other bases

Posted on May 25, 2018 by Brent

In a previous post I wrote about iterating the squared digit sum function, which adds up the sum of the squares of the digits of a number; for example, . Denis left a comment asking about other bases—what happens if … Continue reading →

Posted in arithmetic, computation, proof | Tagged , , , , | 7 Comments

Iterating squared digit sum

Posted on April 26, 2018 by Brent

Another fun fact I learned from John Cook. Let be the function which takes a positive integer and outputs the sum of the squares of its digits. For example, . Since the output is itself another positive integer, we can … Continue reading →

Posted in arithmetic, computation, proof | Tagged , , , , , | 12 Comments