一般人と数学者の違い
111や123
https://stand.fm/episodes/636303b38a7d928c6a8788f8
ドーナツ
https://stand.fm/episodes/636395f20961e2c6cea1c69f
496
https://stand.fm/episodes/63704d44566b8998e81122a7
たし算
https://stand.fm/episodes/6372e4b70b8ba372ac6cac07