W-0025

A superpermutation on 11 symbols, found by Jay Pantone jaypantone. It beat the previous record, W-0018, by 18,118 letters, and was the record for n = 11 from Sep 29 until Oct 1, 2026, when W-0034 was 9 letters shorter.

Length: 43,930,689
Repeated occurrences: 18,816
Announced: Sep 29, 2026

Begins

0123456789A01234567890A12345678901A23456789012A34567890123A45678901234A56789012345A67890123456A78901234567A89012345678A9…

Windows

	43,930,679	windows of 11 consecutive letters
=	39,916,800	distinct permutations, all 11! of them
+	18,816	repeated occurrences of a permutation
+	3,995,063	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 39,916,800 permutations appear	2 s
literal_check	f4687121	agrees on coverage	5 s

SHA-256ff8f29edd6ca7e13ebfa7c2f3da704036bfc42426eb0220ca839a6381a88d1a2 Compilerg++ (Debian 14.2.0-19) 14.2.0

Download

Download Detour (.detour) 7.4 kB, or 43.9 MB decoded

Decode to text

# check it yourself
detour decode W-0025.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-0025.detour 43930689
./target/release/bitmapcheck 11 ../W-0025.detour 43930689
./target/release/wordhash 11 ../W-0025.detour 43930689

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 488,421 tokens: 1 START, 1 literal of 1 byte in all, and 488,419 deviations. Deviations by weight, from 1 to 11: 18,816 · 131,712 · 337,803 · 3 · 8 · 18 · 7 · 31 · 20 · 1 · 0.