time-to-botec/squiggle/node_modules/@stdlib/math/base/special/negalucas

negaLucas

Compute the nth negaLucas number.

The negaLucas numbers are the integer sequence

The sequence is defined by the recurrence relation

which yields

with seed values L_0 = 2 and L_{-1} = -1.

Usage

var negalucas = require( '@stdlib/math/base/special/negalucas' );

negalucas( n )

Computes the nth negaLucas number.

var v = negalucas( 0 );
// returns 2

v = negalucas( -1 );
// returns -1

v = negalucas( -2 );
// returns 3

v = negalucas( -3 );
// returns -4

v = negalucas( -76 );
// returns 7639424778862807

If n < -76, the function returns NaN, as larger negaLucas numbers cannot be safely represented in double-precision floating-point format.

var v = negalucas( -77 );
// returns NaN

If not provided a nonpositive integer value, the function returns NaN.

var v = negalucas( -3.14 );
// returns NaN

v = negalucas( 1 );
// returns NaN

If provided NaN, the function returns NaN.

var v = negalucas( NaN );
// returns NaN

Examples

var negalucas = require( '@stdlib/math/base/special/negalucas' );

var v;
var i;

for ( i = 0; i > -77; i-- ) {
    v = negalucas( i );
    console.log( v );
}