As you can see at the top of this answer, the [color] Scenes (Black Scene, Red Scene, etc.) in the Monogatari series all include a parenthesized number beneath the romanized form of the name of the color shown.
Here's a list of them:
ROMANIZED GLOSS NUMBER KANJI(READING) aka "red" (135) 赤 （あか） kuro "black" (629) 黒 （くろ） shiro "white" (4646) 白 （しろ） ki "yellow" (0303) 黄 （き） ouchi "lilac" (349) 楝 （おうち） ao "blue" (014) 青 （あお） momo "peach" (372) 桃 （もも） moegi "light green" (469) 萌黄（もえぎ） murasaki "purple" (039) 紫 （むらさき）
Question: What do the numbers mean?
- Something to do with color codes (but this is unlikely because neither "white" nor "black" seems to have a special number)
- Some sort of character code for either the kanji, the kana reading, or the romanized form (though I haven't come up with anything for this)
- It's all a clever ruse by Shinbo to confuse us