Pith Number

pith:PKXJRK22

pith:2002:PKXJRK227B3UDCBJNYSXNOYMGG

not attested not anchored not stored refs pending

A New Operation on Sequences: the Boustrouphedon Transform

Jessica Millar, Neal E. Young, N.J.A. Sloane

arxiv:math/0205218 v3 · 2002-05-20 · math.CO · cs.IT · math.IT

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PKXJRK227B3UDCBJNYSXNOYMGG}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T01:59:53.853470Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7aae98ab5af8774188296e2576bb0c3193c305d1b0c1c78d3e4af5ff6552911f

Aliases

arxiv: math/0205218 · arxiv_version: math/0205218v3 · doi: 10.48550/arxiv.math/0205218 · pith_short_12: PKXJRK227B3U · pith_short_16: PKXJRK227B3UDCBJ · pith_short_8: PKXJRK22

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/PKXJRK227B3UDCBJNYSXNOYMGG \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 7aae98ab5af8774188296e2576bb0c3193c305d1b0c1c78d3e4af5ff6552911f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fb8517021eb091c22f730088f20bf8a3e4d0f9f826bf553c8b8d4831515b5f90",
    "cross_cats_sorted": [
      "cs.IT",
      "math.IT"
    ],
    "license": "",
    "primary_cat": "math.CO",
    "submitted_at": "2002-05-20T16:47:41Z",
    "title_canon_sha256": "cb5344a38fb544c7ed77644b31e3f740876e84fd7d0ab26da7b0c03b8c83a595"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/0205218",
    "kind": "arxiv",
    "version": 3
  }
}