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 A152720 A prime-based vector recursion: a(n)={Prime[n],Prime[n-1],-Prime[n-2],...,-1,-1}. 0
 -1, 1, -1, 3, -1, -1, 5, -3, -1, -1, 7, -5, -3, -1, -1, 11, -7, -5, -3, -1, -1, 13, -11, -7, -5, -3, -1, -1, 17, -13, -11, -7, -5, -3, -1, -1, 19, -17, -13, -11, -7, -5, -3, -1, -1, 23, -19, -17, -13, -11, -7, -5, -3, -1, -1, 29, -23, -19, -17, -13, -11, -7, -5, -3, -1, -1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 COMMENTS Row sums are: {-1, 0, 1, 0, -3, -6, -15, -24, -39, -54, -71,...} LINKS FORMULA a(n)={Prime[n],Prime[n-1],-Prime[n-2],...,-1,-1}. EXAMPLE {-1}, {1, -1}, {3, -1, -1}, {5, -3, -1, -1}, {7, -5, -3, -1, -1}, {11, -7, -5, -3, -1, -1}, {13, -11, -7, -5, -3, -1, -1}, {17, -13, -11, -7, -5, -3, -1, -1}, {19, -17, -13, -11, -7, -5, -3, -1, -1}, {23, -19, -17, -13, -11, -7, -5, -3, -1, -1}, {29, -23, -19, -17, -13, -11, -7, -5, -3, -1, -1} MATHEMATICA b[0] = {-1}; b[1] = {1, -1}; b[n_] := b[n] = Join[{Prime[n ]}, {-b[n - 1][[ 1]]}, Table[b[n - 1][[i]], {i, 2, Length[b[n - 1]]}]]; Table[b[n], {n, 0, 10}]; Flatten[%] CROSSREFS Sequence in context: A280533 A229288 A181109 * A131247 A114278 A134836 Adjacent sequences:  A152717 A152718 A152719 * A152721 A152722 A152723 KEYWORD tabl,sign AUTHOR Roger L. Bagula, Dec 11 2008 STATUS approved

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Last modified July 26 11:35 EDT 2021. Contains 346294 sequences. (Running on oeis4.)