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A dropped digit sat in an OEIS entry for years until a Claude agent spotted it. What that means for anyone who copies values from reference tables.
WritingWhat a long-standing error in a math database means for anyone who copies reference values· Oct 24, 2026
A network puzzle: pick as few points as possible so that every point is picked or linked to a picked one. A search I ran with Claude found a smaller set than any published.
WritingA new best-known dominating set for the twelfth Fibonacci cube, and a month-long run with no answer· Sep 26, 2026
When you hand someone results made with AI agents, they need to know what they can check from what you gave them and what they have to take on trust. An editor of a public math database asked me exactly that about a count I had added. The honest answer was "at least this many", not "exactly this many".
WritingAn OEIS editor asked what my "certificates" proved, and I changed how I label evidence· Sep 26, 2026
Every run first had to reproduce the expert's published tables exactly. That let him check the new work on his own machines instead of taking my word for it.
WritingExtending an expert's tables for unsolved take-away games in a way he could check himself· Jul 16, 2026· 3 versions
A number in the OEIS, a public database of number sequences, had a dropped digit for over a decade. A Claude agent spotted it; the right value was confirmed by two separate routes and the entry corrected.
WritingFinding and fixing a number that was wrong in the OEIS for over a decade· Jul 13, 2026
The first OEIS entries counting labeled dependency charts (directed acyclic graphs) in which each task waits on at most two or three others, with proved formulas and values far past the only earlier table.
WritingCounting dependency charts where each task waits on at most two or three others· Jul 5, 2026
Shapes built by gluing copies of two space-filling solids face to face: more counts for the bisymmetric hendecahedron, and the first I could find for the cell of the sphenoid honeycomb.
WritingCounting the shapes built from two space-filling solids, including one with no earlier counts· Jul 5, 2026

Result3

Counts of the shapes you can build by gluing copies of the Josehedron face to face; the OEIS had none before. Mathias Bernhard named this space-filling solid this spring.
EnumerationPublishedCounting the shapes you can build from the Josehedron· verified Aug 15, 2026· 3 versions
In July I pushed the published tables for a set of unsolved take-away games two to four times further. In four of the games, new heap sizes with rare values turned up.
RecordPublishedExtending the tables for a set of unsolved take-away games, checked and built on by the expert who keeps them· Jul 16, 2026· 3 versions
The largest table from the July take-away game work, taken four times past its published end after first reproducing the old table exactly. No new rare value appeared.
RecordPublishedExtending the table for one unsolved take-away game to four times its published length· Jul 5, 2026· 2 versions