A374387 a(n) is the maximal determinant of an n X n symmetric Toeplitz matrix having 0 on the main diagonal and all the first n-1 primes off-diagonal.

1, 0, -4, 36, 129, 3340, 2287607, 162104000, 16943055268, 4059346088384, 474967482901952, 221630954408019520

Offset

0,3

Links

Table of n, a(n) for n=0..11.

Wikipedia, Toeplitz Matrix.

Example

a(5) = 3340:
  [0, 5, 7, 3, 2]
  [5, 0, 5, 7, 3]
  [7, 5, 0, 5, 7]
  [3, 7, 5, 0, 5]
  [2, 3, 7, 5, 0]

Mathematica

a[n_]:=Max[Table[Det[ToeplitzMatrix[Join[{0}, Part[Permutations[Prime[Range[n-1]]], i]]]], {i, (n-1)!}]]; Join[{1}, Array[a, 10]]

Crossrefs

Cf. A071079, A374341.

Cf. A374386 (minimal), A374388 (maximal absolute value), A374389 (minimal nonzero absolute value).

Cf. A374068 (minimal permanent), A374390 (maximal permanent).

Sequence in context: A045490 A318150 A275133 * A060783 A296948 A125756

Adjacent sequences: A374384 A374385 A374386 * A374388 A374389 A374390

Keyword

sign,hard,more

Author

Stefano Spezia, Jul 07 2024

Extensions

a(11) from Giorgos Kalogeropoulos, Jul 10 2024

Status

approved