The numbers you're referring to are ANSI color codes.

ANSI escape codes are a standard for in-band signaling to control cursor location, color, font styling, and other options on video text terminals and terminal emulators. In Blessed, the underlying library, these codes are used to set colors.

Here's a mapping of color codes to colors in Blessed:

0: Black
1: Red
2: Green
3: Yellow
4: Blue
5: Magenta
6: Cyan
7: White

These are the basic colors. In some terminal configurations, these colors may be different due to customization or the terminal's color scheme.