Pith Number

pith:FMI7FCWY

pith:2013:FMI7FCWYWL3BNFARVZHXFYJFMO

not attested not anchored not stored refs pending

On the irrationality exponent of the regular paperfolding numbers

Wen Wu, Yingjun Guo, Zhixiong Wen

arxiv:1310.2138 v1 · 2013-10-08 · math.NT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{FMI7FCWYWL3BNFARVZHXFYJFMO}

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	2026-05-18T02:50:50.444979Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2b11f28ad8b2f6169411ae4f72e1256384796d71ebdfc15efcee8c211d9074b0

Aliases

arxiv: 1310.2138 · arxiv_version: 1310.2138v1 · doi: 10.48550/arxiv.1310.2138 · pith_short_12: FMI7FCWYWL3B · pith_short_16: FMI7FCWYWL3BNFAR · pith_short_8: FMI7FCWY

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/FMI7FCWYWL3BNFARVZHXFYJFMO \
  | 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: 2b11f28ad8b2f6169411ae4f72e1256384796d71ebdfc15efcee8c211d9074b0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "81e399595885758211d473dfca247e71d8c2b09993340d5eb9d3b5228827210a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NT",
    "submitted_at": "2013-10-08T14:00:28Z",
    "title_canon_sha256": "2356971fbe00b40b2ea51cc0a21b073eac4d6546b222db897e048820e070c70d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1310.2138",
    "kind": "arxiv",
    "version": 1
  }
}