npm package: @stdlib/constants-float64-max-safe-lucas
Description: Maximum safe Lucas number when stored in double-precision floating-point format.
Author: The Stdlib Authors
Latest version: 0.2.3

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# FLOAT64_MAX_SAFE_LUCAS

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Maximum safe [Lucas number][lucas-number] when stored in [double-precision floating-point][ieee754] format.

<section class="installation">

## Installation

```bash
npm install @stdlib/constants-float64-max-safe-lucas
```

</section>

<section class="usage">

## Usage

```javascript
var FLOAT64_MAX_SAFE_LUCAS = require( '@stdlib/constants-float64-max-safe-lucas' );
```

#### FLOAT64_MAX_SAFE_LUCAS

The maximum [safe][safe-integers] [Lucas number][lucas-number] when stored in [double-precision floating-point][ieee754] format.

```javascript
var bool = ( FLOAT64_MAX_SAFE_LUCAS === 7639424778862807 );
// returns true
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var FLOAT64_MAX_SAFE_LUCAS = require( '@stdlib/constants-float64-max-safe-lucas' );

var v;
var i;

function lucas( n ) {
    var a;
    var b;
    var c;
    var i;

    a = 2;
    if ( n === 0 ) {
        return a;
    }
    b = 1;
    for ( i = 2; i <= n; i++ ) {
        c = a + b;
        a = b;
        b = c;
    }
    return b;
}

for ( i = 0; i < 100; i++ ) {
    v = lucas( i );
    if ( v > FLOAT64_MAX_SAFE_LUCAS ) {
        console.log( 'Unsafe: %d', v );
    } else {
        console.log( 'Safe:   %d', v );
    }
}
```

</section>

<!-- /.examples -->

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* * *

<section class="c">

## C APIs

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<section class="intro">

</section>

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<!-- C usage documentation. -->

<section class="usage">

### Usage

```c
#include "stdlib/constants/float64/max_safe_lucas.h"
```

#### STDLIB_CONSTANT_FLOAT64_MAX_SAFE_LUCAS

Macro for the maximum [safe][safe-integers] [Lucas number][lucas-number] when stored in [double-precision floating-point][ieee754] format.

</section>

<!-- /.usage -->

<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

</section>

<!-- /.notes -->

<!-- C API usage examples. -->

<section class="examples">

</section>

<!-- /.examples -->

</section>

<!-- /.c -->

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<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/constants-float64/max-safe-fibonacci`][@stdlib/constants/float64/max-safe-fibonacci]</span><span class="delimiter">: </span><span class="description">maximum safe Fibonacci number when stored in double-precision floating-point format.</span>
-   <span class="package-name">[`@stdlib/constants-float64/max-safe-nth-lucas`][@stdlib/constants/float64/max-safe-nth-lucas]</span><span class="delimiter">: </span><span class="description">maximum safe nth Lucas number when stored in double-precision floating-point format.</span>

</section>

<!-- /.related -->

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<section class="main-repo" >

* * *

## Notice

This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].

#### Community

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---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

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[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules

[deno-url]: https://github.com/stdlib-js/constants-float64-max-safe-lucas/tree/deno
[deno-readme]: https://github.com/stdlib-js/constants-float64-max-safe-lucas/blob/deno/README.md
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[esm-url]: https://github.com/stdlib-js/constants-float64-max-safe-lucas/tree/esm
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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/constants-float64-max-safe-lucas/main/LICENSE

[safe-integers]: http://www.2ality.com/2013/10/safe-integers.html

[lucas-number]: https://en.wikipedia.org/wiki/Lucas_number

[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985

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[@stdlib/constants/float64/max-safe-fibonacci]: https://www.npmjs.com/package/@stdlib/constants-float64-max-safe-fibonacci

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