Re: [math-fun] Ulam(1,2)

At 08:29 PM 2/11/03 -0500, you wrote:

If anyone is interested, I have a list of the Ulam(1,2) numbers <= 5,000,000 and I expect to have one for <= 10,000,000 tomorrow. If you want me to send you a copy, let me know. The former is over 3MB, storing the numbers in an ASCII text file. It is 900KB zipped, or 1.5MB stored as 32-bit (binary) integers.

I bet that if you encode the list with first-order differences, the file size shrinks dramatically. Especially if you then zip, because so many of the differences recur so frequently, the zip compressor will have a lot of repetition to compress. -A