// time = 0.12 seconds

data[20]:=[*
<20, 1, 1, [ -1, 1 ], 0, [
<2, x>,
<3, x + 2>,
<5, x + 1>,
<7, x - 2>,
<11, x>,
<13, x - 2>,
<17, x + 6>,
<19, x + 4>
]>
*];