W-0023
A superpermutation on 8 symbols, found by rumstd. It beat the previous record, W-0022, by 2 letters, and was the record for n = 8 from Sep 28 until Sep 29, 2026, when W-0028 was 7 letters shorter.
- Length
- 46,188
- Repeated occurrences
- 48
- Announced
- Sep 28, 2026
012345670123456071234560172345601273456012374560123475601234576012345067123450617234506127345061237450612347506123457061…
Windows
| 46,181 | windows of 8 consecutive letters | |
| = | 40,320 | distinct permutations, all 8! of them |
| + | 48 | repeated occurrences of a permutation |
| + | 5,813 | windows that are not permutations |
How it was found
Found with an LLM-designed 'improvement theoretical framework' (rumstd's README); submitted to superpermutators/superperm as PR #56 (opened 2026-09-29 11:08 UTC, merged 2026-10-01); Theo H. reported that it has 48 repeated permutations.
Checking
| Program | Source | Result | Time |
|---|---|---|---|
| permcheck | c46d3654 | all 40,320 permutations appear | under 1 s |
| literal_check | f4687121 | agrees on coverage | under 1 s |
Download
Download Detour (.detour) 232 bytes, or 46.2 kB decoded
Download text (.txt) 46.2 kB
# check it yourself
detour decode W-0023.detour - | tr -d '\n' | shasum -a 256
tar xzf checkers-rs-source.tar.gz && cd checkers-rs && cargo build --release --locked
./target/release/classcheck 8 ../W-0023.detour 46188
./target/release/bitmapcheck 8 ../W-0023.detour 46188
./target/release/wordhash 8 ../W-0023.detour 46188
Decoding needs detour; see the Detour format for how to build and install it. The checkers are in checkers-rs-source.tar.gz, which needs Rust 1.89 or later; each one decodes the file itself, so the word is never written out.
The file's header gives n = 8 and sync exponent 0. The file has 813 tokens: 1 START, 1 literal of 1 byte in all, and 811 deviations. Deviations by weight, from 1 to 8: 48 · 192 · 549 · 3 · 15 · 3 · 1 · 0.