trureturingGitHub MATHEMATICAL ATLAS

Combinatorics / CONCEPT

Richman's congruence for A053871

For the deranged-matching numbers a(n), which are also the central moments of the chi-squared distribution with one degree of freedom, the signed values (-1)^n a(n) are periodic with period q modulo every odd q.

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THEOREM

Proof of the conjecture

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Richman's congruence for A053871Richman's congruence forA053871
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Lean sourceResearch workspace
Status
Closed
Depth
0
Layer
D5/S3
Domain
Combinatorics
Node ID
D5/S3/Combinatorics/DerangedMatchingCongruence
Repository path
D5/S3/Combinatorics/DerangedMatchingCongruence.lean
Truth release
sha256:76a8db6a0f78609b1b9d4a959c8392f2752f2daaddc1930e046e34ce07d0f608
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b52262a023c4db9bb30a128ebfd80ea4ef4c1a53
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37a24ddf3b9983bdabf0acbfd9b32b06c35c28d3

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Dependency edges, status, and source coordinates come from the verified release and certified topology. Blueprint exposition is labeled separately. A fallback title carries no additional mathematical authority.