W-0029

A superpermutation on 9 symbols, found by Jay Pantone jaypantone. It beat the previous record, W-0017, by 229 letters, and was the record for n = 9 from Sep 29 until Oct 1, 2026, when W-0037 was 4 letters shorter.

Length: 408,736
Repeated occurrences: 336
Announced: Sep 29, 2026

Begins

012345678012345670812345670182345670128345670123845670123485670123458670123456870123456078123456071823456071283456071238…

Windows

	408,728	windows of 9 consecutive letters
=	362,880	distinct permutations, all 9! of them
+	336	repeated occurrences of a permutation
+	45,512	windows that are not permutations

How it was found

The 43/80 construction followed by a computer search for local improvements.

Checking

Program	Source	Result	Time
permcheck	c46d3654	all 362,880 permutations appear	under 1 s
literal_check	f4687121	agrees on coverage	under 1 s

SHA-256f9ff6d0b0f6637bcb5c22296b3887288206d6cf2f6c6e0ac9f0426f819cef01e Compilerg++ (Debian 14.2.0-19) 14.2.0

Download

Download Detour (.detour) 520 bytes, or 408.7 kB decoded

Download text (.txt) 408.7 kB

Decode to text

# check it yourself
detour decode W-0029.detour - | tr -d '\n' | shasum -a 256
tar xzf checkers-rs-source.tar.gz && cd checkers-rs && cargo build --release --locked
./target/release/classcheck 9 ../W-0029.detour 408736
./target/release/bitmapcheck 9 ../W-0029.detour 408736
./target/release/wordhash 9 ../W-0029.detour 408736

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 = 9 and sync exponent 0. The file has 6,747 tokens: 1 START, 1 literal of 1 byte in all, and 6,745 deviations. Deviations by weight, from 1 to 9: 336 · 1,680 · 4,680 · 0 · 2 · 40 · 7 · 0 · 0.