Programming puzzle: Longest list of regular numbers?

[Han]

(04-17-2017 03:30 PM)pier4r Wrote:  You algorithm is very interesting, I adapted one using the known algorithm how to solve it and still it is slower than yours (I'm not sure how much does it cost to put all the numbers in a list though).

378 seconds for 1429 numbers.

Creating a list is expensive due to the memory allocations and possible garbage collection. Also, I wonder if your use of IFT is also compounding the time. I wonder if IF THEN END is faster than IFT.