# What is a Richi Word™?

This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.

If a word conforms to a special rule, I call it a Richi Word™.
Use the following examples below to find the rule.

$$% set Title text. (spaces around the text ARE important; do not remove.) % increase Pad value only if your entries are longer than the title bar. % \def\Pad{\P{1}} \def\Title{\textbf{ Richi }} % \def\S#1#2{\Space{#1}{20px}{#2px}}\def\P#1{\V{#1em}}\def\V#1{\S{#1}{9}} \def\T{\Title\textbf{Words}^{\;\!™}\Pad}\def\NT{\Pad\textbf{Not}\T\ }\displaystyle \smash{\lower{29px}\bbox[yellow]{\phantom{\rlap{rubio.2019.05.15}\S{6px}{0} \begin{array}{cc}\Pad\T&\NT\\\end{array}}}}\atop\def\V#1{\S{#1}{5}} \begin{array}{|c|c|}\hline\Pad\T&\NT\\\hline % \text{ CUB }&\text{ BEAR }\\ \hline \text{ AIR }&\text{ WATER }\\ \hline \text{ WEB }&\text{ NET }\\ \hline \text{ MOOD }&\text{ MIND }\\ \hline \text{ MISS }&\text{ FAIL }\\ \hline \text{ PLAY }&\text{ WORK }\\ \hline \text{ NOPE }&\text{ YUP }\\ \hline \text{ GRIND }&\text{ POLISH }\\ \hline \text{ BLACK }&\text{ WHITE }\\ \hline \text{ DECODE }&\text{ ENCODE }\\ \hline \end{array}$$

And, if you want to analyze, here is a CSV version:

Richi Words™,Not Richi Words™
CUB,BEAR
AIR,WATER
WEB,NET
MOOD,MIND
MISS,FAIL
PLAY,WORK
NOPE,YUP
GRIND,POLISH
BLACK,WHITE
DECODE,ENCODE


Hint 1:

Hint 2:

Added Language tag here. The title may be applicable, but the rule for Richi Word™ is not.

Hint 3:

$$3n+2-1$$

• I might need a hint for this one – GrumpyLlama59 Nov 4 '19 at 18:06
• @GrumpyLlama59 Here it is :) – Conifers Nov 5 '19 at 14:43
• Does this need the Language tag? – Kyle Williamson Nov 5 '19 at 21:58
• I've had the connection that the hints are pointing to since the puzzle was posted (though surely that should be "ii" rather than "i"?). I just don't know how to use that connection. – Deusovi Nov 8 '19 at 16:47
• I'm in the same boat as @Deusovi I reckon - I know what it's based on, but quite how to derive the numbers I don't know! Still, my last half hour has taught me a lot about symbols I never knew you could make in Unicode! – Stiv Nov 21 '19 at 20:12