MASAさん on the Japan Ayu BBS noted that on
Oricon, there's a chart for the number of times an artist has been #1 on the charts. B'z tops the list with 32, followed by Seiko Matsuda with 25, Mr.Children with 22, Akina Nakamori with 21, and Ayu with 20 times at #1
●表1 歴代シングル首位獲得数記録
順位 作品数 アーティスト
1 32 B'z
2 25 松田聖子
3 22 Mr.Children
4 21 中森明菜
5 20 浜崎あゆみ