>>251
こんな感じ?

(defun my-navi2ch-bm-jump-article-number (num)
(interactive "nArticle No.: ")
(beginning-of-buffer)
(re-search-forward (concat "^" (regexp-quote (format "%3d" num)))))

(define-key navi2ch-board-mode-map "j" 'my-navi2ch-bm-jump-article-number)