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 A228623 Determinant of the n X n matrix with (i,j)-entry (i,j = 0,...,n-1) equal to 1 or 0 according as n + i - j and n - i + j are both prime or not. 3
 0, 1, 1, 1, 0, -1, 0, 0, 0, -4, -1, 0, 0, 0, -6, 0, 0, -144, 0, 0, 0, -1, 168, 1024, 420, 0, 0, 0, -1, -9801, 0, 144, 0, 0, 3072, 7056, 0, 0, -42346434, 0, 0, -331776, 0, 0, 36528128, -104976, 96545145, 0, 34665386, -62500, 2826240, 2025, 0, -23174596, 0, 0, 255578880, -4, -3, 990172089 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,10 COMMENTS Conjecture: a(n) is nonzero if n is odd and greater than 120. This implies Goldbach's conjecture for even numbers of the form 4*k + 2. LINKS Zhi-Wei Sun, Table of n, a(n) for n = 1..400 EXAMPLE a(1) = 0 since 1 + 0 - 0 = 1 is not a prime. MATHEMATICA a[n_]:=Det[Table[If[PrimeQ[n+j-i]==True&&PrimeQ[n+i-j]==True, 1, 0], {i, 0, n-1}, {j, 0, n-1}]] Table[a[n], {n, 1, 20}] CROSSREFS Cf. A002372, A228591, A228615, A228616, A228557, A228559. Sequence in context: A355829 A265421 A137252 * A036875 A036877 A049763 Adjacent sequences: A228620 A228621 A228622 * A228624 A228625 A228626 KEYWORD sign AUTHOR Zhi-Wei Sun, Aug 27 2013 STATUS approved

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Last modified May 30 00:31 EDT 2024. Contains 372954 sequences. (Running on oeis4.)