Pith Number

pith:H4QBKT4O

pith:2016:H4QBKT4OHCZRUYXGMKSLHVUWGY

not attested not anchored not stored refs pending

Sum of two repdigits a square

Bart Goddard, Jeremy Rouse

arxiv:1607.06681 v1 · 2016-07-22 · 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{H4QBKT4OHCZRUYXGMKSLHVUWGY}

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	2026-05-18T00:25:34.895962Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3f20154f8e38b31a62e662a4b3d6963620f707e95dd14d232c8e0fefd822d377

Aliases

arxiv: 1607.06681 · arxiv_version: 1607.06681v1 · doi: 10.48550/arxiv.1607.06681 · pith_short_12: H4QBKT4OHCZR · pith_short_16: H4QBKT4OHCZRUYXG · pith_short_8: H4QBKT4O

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/H4QBKT4OHCZRUYXGMKSLHVUWGY \
  | 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: 3f20154f8e38b31a62e662a4b3d6963620f707e95dd14d232c8e0fefd822d377

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b327aa7af944c703121f9030a7dda39c530a85da5b1af82d494ae4b54d8fbed3",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NT",
    "submitted_at": "2016-07-22T13:50:13Z",
    "title_canon_sha256": "51d8d2e226c7f40b7b7cb2c090135b15a090603e4c01d1f419b0d7ee47ad4b7b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1607.06681",
    "kind": "arxiv",
    "version": 1
  }
}