W-0030

A superpermutation on 12 symbols, found by Jay Pantone jaypantone. It beat the previous record, W-0026, by 4,380 letters, and was the record for n = 12 on Sep 29, 2026, when W-0032 was 45 letters shorter.

Length: 522,748,520
Repeated occurrences: 169,344
Announced: Sep 29, 2026

Begins

0123456789AB0123456789A0B123456789A01B23456789A012B3456789A0123B456789A01234B56789A012345B6789A0123456B789A01234567B89A0…

Windows

	522,748,509	windows of 12 consecutive letters
=	479,001,600	distinct permutations, all 12! of them
+	169,344	repeated occurrences of a permutation
+	43,577,565	windows that are not permutations

How it was found

The tighter construction, with connector cycles chosen again (2,843 instead of 2,856).

Checking

Program	Source	Result	Time
permcheck	c46d3654	all 479,001,600 permutations appear	30 s
literal_check	f4687121	agrees on coverage	1 min 16 s

SHA-2560d1c72dd3010821646eb7731c7317a531732e12dd45f8ebd1597a43266cf6f1b Compilerg++ (Debian 14.2.0-19) 14.2.0

Download

Download Detour (.detour) 38.1 kB, or 522.7 MB decoded

Decode to text

# check it yourself
detour decode W-0030.detour - | tr -d '\n' | shasum -a 256
tar xzf checkers-rs-source.tar.gz && cd checkers-rs && cargo build --release --locked
./target/release/classcheck 12 ../W-0030.detour 522748520
./target/release/bitmapcheck 12 ../W-0030.detour 522748520
./target/release/wordhash 12 ../W-0030.detour 522748520

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 = 12 and sync exponent 0. The file has 4,903,421 tokens: 1 START, 1 literal of 1 byte in all, and 4,903,419 deviations. Deviations by weight, from 1 to 12: 169,344 · 1,354,752 · 3,378,448 · 6 · 0 · 53 · 264 · 56 · 47 · 47 · 70 · 332.