FormalConjectures/OEIS/113255.lean

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Explanation legend Lean4 Domain Explanation Language (L4DEL)

L4DEL explanations are a separate layer. They do not change the Lean source. Intuition is explanatory prose; numbered items are a reading path; sources link the wording back to evidence.

L4DEL
Lean4 Domain Explanation Language

Credit: The upstream authors and contributors retain credit for the project and mathematics. lean4-explainer only renders their pinned source and adds the separately disclosed explanation layer.

Project sources: Pinned project documentation, Formal Conjectures paper, arXiv v1

7 declarations, 1 contain sorry, 0 declared as axioms

Conjectures associated with A113255

Corresponds to m = 9 in a family of 4th-order linear recurrence sequences

This sequence is defined by the recurrence relation $a(n) = -4 a(n-1) + 324 a(n-3) + 6561 a(n-4)$ for n > 3. Initial values are $a(0) = -1, a(1) = 4, a(2) = 227, a(3) = 5329$.

References:

Imports (1)
  1. def OeisA113255.a a n is the sequence defined by the linear recurrence $a(n) = -4 a(n-1) + 324 a(n-3) + 6561 a(n-4)$ with initial values $-1, 4, 227, 5329$ line 41 source

    Source documentation

    a n is the sequence defined by the linear recurrence $a(n) = -4 a(n-1) + 324 a(n-3) + 6561 a(n-4)$ with initial values $-1, 4, 227, 5329$.

    no axioms what this means

    Statement uses: Nat, Int

    2 instances, coercions and auxiliary constants left out.

    def a : ℕ → ℤ
    | 0 => -1
    | 1 => 4
    | 2 => 227
    | 3 => 5329
    | n + 4 => -4 * a (n + 3) + 324 * a (n + 1) + 6561 * a n
    
    @[category test, AMS 11]

    Mentions: test, AMS

  2. theorem OeisA113255.a_0 line 49 source

    no axioms what this means

    Statement uses: Eq, Int, OeisA113255.a, OfNat.ofNat, Nat, Neg.neg

    Proof uses: Eq.refl

    4 instances, coercions and auxiliary constants left out.

    Tactic trace: 1 steps

    Open to load the checked before-and-after goal states.

  3. theorem OeisA113255.a_1 line 52 source

    no axioms what this means

    Statement uses: Eq, Int, OeisA113255.a, OfNat.ofNat, Nat

    Proof uses: Eq.refl

    3 instances, coercions and auxiliary constants left out.

    Tactic trace: 1 steps

    Open to load the checked before-and-after goal states.

  4. theorem OeisA113255.a_2 line 55 source

    no axioms what this means

    Statement uses: Eq, Int, OeisA113255.a, OfNat.ofNat, Nat

    Proof uses: Eq.refl

    3 instances, coercions and auxiliary constants left out.

    Tactic trace: 1 steps

    Open to load the checked before-and-after goal states.

  5. theorem OeisA113255.a_3 line 58 source

    no axioms what this means

    Statement uses: Eq, Int, OeisA113255.a, OfNat.ofNat, Nat

    Proof uses: Eq.refl

    3 instances, coercions and auxiliary constants left out.

    Tactic trace: 1 steps

    Open to load the checked before-and-after goal states.

  6. theorem OeisA113255.a_4 line 61 source

    no axioms what this means

    Statement uses: Eq, Int, OeisA113255.a, OfNat.ofNat, Nat, Neg.neg

    Proof uses: Eq.refl

    4 instances, coercions and auxiliary constants left out.

    Tactic trace: 1 steps

    Open to load the checked before-and-after goal states.

  7. theorem OeisA113255.conjecture sorry line 70 source

    depends on sorry what this means

    Statement uses: Nat, IsSquare, Int, OeisA113255.a, HAdd.hAdd, HMul.hMul, OfNat.ofNat

    Proof uses: sorryAx, Lean.Name, Bool.false, Lean.Name.num, Lean.Name.str, Lean.Name.anonymous

    12 instances, coercions and auxiliary constants left out.

    Tactic trace: 1 steps

    Open to load the checked before-and-after goal states.