Pith Number

pith:YIYJJ6SU

pith:2026:YIYJJ6SUOSRFXPZTEDKCKBY6ZP

not attested not anchored not stored refs pending

Human vs Machine Mathematical Difficulty on Project Euler: An Experimental Analysis

David Holmes, Johannes Schmitt

arxiv:2606.21972 v1 · 2026-06-20 · cs.AI · math.HO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{YIYJJ6SUOSRFXPZTEDKCKBY6ZP}

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	2026-06-23T02:13:04.657266Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c23094fa5474a25bbf3320d425071ecbdcb4aa9cf91f2bf6a9d1432987e83621

Aliases

arxiv: 2606.21972 · arxiv_version: 2606.21972v1 · doi: 10.48550/arxiv.2606.21972 · pith_short_12: YIYJJ6SUOSRF · pith_short_16: YIYJJ6SUOSRFXPZT · pith_short_8: YIYJJ6SU

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/YIYJJ6SUOSRFXPZTEDKCKBY6ZP \
  | 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: c23094fa5474a25bbf3320d425071ecbdcb4aa9cf91f2bf6a9d1432987e83621

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9ae77db6ca8c6d752e2b168159299f36a39ea5afa2ac9833c73f8ccc2dc2497d",
    "cross_cats_sorted": [
      "math.HO"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.AI",
    "submitted_at": "2026-06-20T10:01:18Z",
    "title_canon_sha256": "9e51c91a506cbca2f2584d985ec71eb3f80f32dca80f57acd98adf23146d7fa8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2606.21972",
    "kind": "arxiv",
    "version": 1
  }
}