{"id": "c1547", "title": "C1547 — Trace theMT/LXX prefix difference to Lamech", "filename": "C1547.md", "role": "Research action", "step": 1547, "sha256": "01d5c9a2abfe34def8564884ef5aca9c9b80c86050d957ea8592d8fe3ac5c738", "bytes": 1010, "origins": ["C480–C1634/Research_Cycles/C1483_C1582/c1483_c1582/journal.json#C1547"], "download": "/sources/01d5c9a2abfe34def8564884ef5aca9c9b80c86050d957ea8592d8fe3ac5c738.md", "format": "md", "derived": true, "tags": ["Cumulative", "Rounded"], "excerpt": "Which source lifespan causes the20-year prefix difference?", "content": "# C1547 — Trace theMT/LXX prefix difference to Lamech\n\n## Question\n\nWhich source lifespan causes the20-year prefix difference?\n\n## Sources\n\n```json\n[\n  \"File18.md selected753 decision\",\n  \"File51a.md roundingrule\"\n]\n```\n\n## Opened utc\n\n2026-09-29T02:37:40.585065+00:00\n\n## Results\n\n```json\n{\n  \"rounded_differences\": [\n    0,\n    0,\n    0,\n    0,\n    0,\n    0,\n    0,\n    0,\n    -20\n  ],\n  \"actual_Lamech\": [\n    777,\n    753\n  ],\n  \"rounded_Lamech\": [\n    775,\n    755\n  ],\n  \"prefixes\": [\n    7620,\n    7600\n  ]\n}\n```\n\n## Finding\n\nThe first eight rounded preNoah lives agree; selected Lamech775 versus755 accounts for the entire−20 prefix difference.\n\n## Reassessment\n\nInspect how that small difference changes the retained trailing-zero register.\n\n## Checks\n\n```json\n{}\n```\n\n## Closed utc\n\n2026-09-29T02:37:40.585339+00:00\n\n## Record provenance\n\nExact record hash: `eb46cb62e228fef440399b09dad7a03500cf921a95c557f53f8ae01e37004eea`\n\nSource journal: `Research_Cycles/C1483_C1582/c1483_c1582/journal.json`", "journalDownload": "/sources/7241bc8dee3ba293341214bcb88dc4f80832f7d0207eb9e07f9364c06d3847c8.json", "evidenceLinks": [{"id": "d-68301ab760bfbe2e", "title": "File 18"}, {"id": "d-d8aa38afb2a2df8f", "title": "File 51a"}]}