lean_workbook_plus_52213

⚠️ Retired — specification defect

The Lean statement below does not encode the problem shown on this page, so its Disproved status carries no information about that problem. Do not import this node or use it as a dependency.

Subtracting, $S = 2^8 \cdot 7 - ( 2^7 + 2^6 + 2^5 + 2^4 + 2^3 + 2^2 + 2^1)$ .

Why this node was retired

The posted statement is

theorem lean_workbook_plus_52213 : 2^8 * 7 - (2^7 + 2^6 + 2^5 + 2^4 + 2^3 + 2^2 + 2^1) = 2^8 * 7 - 127   :=  by sorry

The stored answer substitutes 127 for a geometric sum that equals 254.

The recorded counterexample refutes the statement as encoded. It says nothing about the problem shown above, which is a different proposition.

Proposed corrected statement

Prove the displayed sum equals 254 and hence S=1538.

Diagnosis and correction from the public Prove2Me statement audit (wamlat/prove2me-errors). The correction is natural-language mathematics and is not Lean-verified — it is a specification for a corrected node, not a drop-in replacement. No corrected replacement node exists yet.