[seqfan] Re: Squares with even-positioned digits matching the original number
Kevin Ryde
user42_kevin at yahoo.com.au
Sun Dec 3 06:25:07 CET 2023
Tim Peters <tim.peters at gmail.com> writes:
>
> OK - changing the algorithm to build suffixes
I tried the same. Among lengths <= 22 digits, one further term,
with only about medium confidence of not missing anything.
8999444174739301478678 length 22
> (very roughly) sqrt(10^k) feasible suffixes. For k=20
> above, about 4.4 billion were generated.
Yes about 10x more for 2 more digits on a slightly different
measure of how many times reach maximum length without the
pruning stopping it earlier.
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