How to display different number of posts

This can be done with a very short plugin.

function posts_on_home_page( $posts_per_page ) {
    if ( is_home() )
        return 5;
    return $posts_per_page;
}

add_filter( 'pre_option_posts_per_page', 'posts_on_home_page' );

This is actually pretty close to the Codex example for pre_option_(option_name).

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