Pith Number

pith:42FQPH6U

pith:2015:42FQPH6UHIKE3PFSNFROJ6TSC3

not attested not anchored not stored refs pending

On the Combinatorics of Palindromes and Antipalindromes

Arseny M. Shur, Chuan Guo, Jeffrey Shallit

arxiv:1503.09112 v1 · 2015-03-31 · cs.FL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{42FQPH6UHIKE3PFSNFROJ6TSC3}

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	2026-05-18T01:04:50.626527Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e68b079fd43a144dbcb26962e4fa7216fe81b266b9e4b76a85b8f3ae3a43800c

Aliases

arxiv: 1503.09112 · arxiv_version: 1503.09112v1 · doi: 10.48550/arxiv.1503.09112 · pith_short_12: 42FQPH6UHIKE · pith_short_16: 42FQPH6UHIKE3PFS · pith_short_8: 42FQPH6U

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/42FQPH6UHIKE3PFSNFROJ6TSC3 \
  | 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: e68b079fd43a144dbcb26962e4fa7216fe81b266b9e4b76a85b8f3ae3a43800c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5920e78e067320ed9416774ada7ce46be829a6ca0982b8984566b0b554e3ea01",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2015-03-31T16:26:13Z",
    "title_canon_sha256": "416a0f47797751c4138151cbfe0098cee08a6c7117c1de5a192586ad963ebfc4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1503.09112",
    "kind": "arxiv",
    "version": 1
  }
}