I started by using [[single time]] to count with the help of this box.
On breathing in, I count and optionally visualize a number inside or near the box as I go up the leftmost edge.
On not yet breathing out, I go right through the upper edge.
On breathing out, I go down the rightmost edge.
While I do this, optionally, I [[factorize]] the number or evaluate it according to some well known function.
If the number is known to be prime, optionally, I calculate its multiples until I start another breath.
If some multiple is known to be interesting, I stop there and make a mental note of where I stopped.
[[119]] is known to be interesting, for example, because it was the first multiple of [[17]] which I found interesting in one particular run through this process.
It was the first number that I couldn’t decide as prime or composite based on some procedure simpler than knowing it was a multiple of 17.