Different Text on Some Category Pages

I am trying to add custom text to category pages. On Category three, I want just the title of the category. On all other category pages, I want to add a link under the title. This is the code I have and it is not working. Any help would be appreciated!

(From archives.php)

<?php /* If this is a category archive */ if (is_category()) { ?>
<h2 class="pagetitle"><?php single_cat_title(); ?></h2><br /><br />

<?php } elseif (is_category('3')) { ?>
<h2 class="pagetitle"><?php single_cat_title(); ?></h2><br /><br />
<a href="#">Link</a></h2>aa

I have also tried this, which doesn’t work:

<?php /* If this is a category archive */ if (is_category('1,2,4,6')) { ?>
<h2 class="pagetitle"><?php single_cat_title(); ?></h2><br /><br />

<?php } elseif (is_category('3')) { ?>
<h2 class="pagetitle"><?php single_cat_title(); ?></h2><br /><br />
<a href="#">Link</a></h2>aa