W-0052
A superpermutation on 11 symbols, found by Jakub Halfar. It beat the previous record, W-0048, by 9 letters, and was the record for n = 11 from Oct 5 until Oct 6, 2026, when W-0063 was 36 letters shorter.
- Length
- 43,930,614
- Repeated occurrences
- 18,816
- Announced
- Oct 5, 2026
0123456789A01234567890A12345678901A23456789012A34567890123A45678901234A56789012345A67890123456A78901234567A89012345678A9…
Windows
| 43,930,604 | windows of 11 consecutive letters | |
| = | 39,916,800 | distinct permutations, all 11! of them |
| + | 18,816 | repeated occurrences of a permutation |
| + | 3,994,988 | windows that are not permutations |
How it was found
Pantone's closed trails, with the cuts set by a dynamic programme and the order changed by local moves; the first word in PR #8.
Checking
Total check time: 2 s, including preparation but not time in the queue.
| Program | Source | Result | Time |
|---|---|---|---|
| classcheck | 41928cce | all 39,916,800 permutations appear, by rotation class | under 1 s |
| bitmapcheck | 288b3f67 | agrees, by Lehmer rank | 1 s |
| wordhash | 94925fe4 | the SHA-256 of the word and of its mirror | under 1 s |
Download
Download Detour (.detour) 7.3 kB, or 43.9 MB decoded
# check it yourself
detour decode W-0052.detour - | tr -d '\n' | shasum -a 256
tar xzf checkers-rs-source.tar.gz && cd checkers-rs && cargo build --release --locked
./target/release/classcheck 11 ../W-0052.detour 43930614
./target/release/bitmapcheck 11 ../W-0052.detour 43930614
./target/release/wordhash 11 ../W-0052.detour 43930614
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 = 11 and sync exponent 0. The file has 488,988 tokens: 1 START, 1 literal of 1 byte in all, and 488,986 deviations. Deviations by weight, from 1 to 11: 18,816 · 131,652 · 338,429 · 25 · 16 · 2 · 1 · 39 · 6 · 0 · 0.