A152755 Triangle read by rows: row n gives the vector b[n] where b[0] = {-1}; b[1] = {1, -1}; b[n] = prime[n + 2 ], -prime[n + 2] + n - 1, -1,-1, ..., -1.

-1, 1, -1, 7, -6, -1, 11, -9, -1, -1, 13, -10, -1, -1, -1, 17, -13, -1, -1, -1, -1, 19, -14, -1, -1, -1, -1, -1, 23, -17, -1, -1, -1, -1, -1, -1, 29, -22, -1, -1, -1, -1, -1, -1, -1, 31, -23, -1, -1, -1, -1, -1, -1, -1, -1, 37, -28, -1, -1, -1, -1, -1, -1, -1, -1, -1

Offset

0,4

Links

G. C. Greubel, Table of n, a(n) for the first 51 rows, flattened

Example

{-1},
{1, -1},
{7, -6, -1},
{11, -9, -1, -1},
{13, -10, -1, -1, -1},
{17, -13, -1, -1, -1, -1},
{19, -14, -1, -1, -1, -1, -1},
{23, -17, -1, -1, -1, -1, -1, -1},
{29, -22, -1, -1, -1, -1, -1, -1, -1},
{31, -23, -1, -1, -1, -1, -1, -1, -1, -1},
{37, -28, -1, -1, -1, -1, -1, -1, -1, -1, -1}

Mathematica

b[0] = {-1}; b[1] = {1, -1};
b[n_] := b[n] = Join[{Prime[n + 2 ]}, {-Prime[ n + 2] + (n - 1)}, Table[ -1, {i, 2, Length[b[n - 1]]}]];
Table[b[n], {n, 0, 10}]; Flatten[%]

Crossrefs

Sequence in context: A347074 A112252 A118321 * A152722 A100082 A152861

Adjacent sequences: A152752 A152753 A152754 * A152756 A152757 A152758

Keyword

tabl,sign

Author

Roger L. Bagula and Alexander R. Povolotsky, Dec 12 2008

Extensions

Edited by N. J. A. Sloane, Dec 13 2008

Status

approved