# What is an IJKLMN Number™?

This is in the spirit of the What is a Word/Phrase™ series started by JLee with Number version puzzles.

If a number conforms to a special rule, I call it an IJKLMN Number™.
Use the following examples below to find the rule.

IJKLMN NumbersTM Not IJKLMN NumbersTM
3 11
9 17
33 41
92 100
108 116
175 183
1,104 1,112
4,089 4,097
15,090 15,098
32,032 32,040

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

IJKLMN Numbers™,Not IJKLMN Numbers™
3,11
9,17
33,41
92,100
108,116
175,183
1104,1112
4089,4097
15090,15098
32032,32040


Hint 1:

• does it have anything to do with the number 3 Nov 10, 2019 at 3:48
• @MilesZew Hmm maybe not :) Nov 11, 2019 at 0:54
• then prime numbers perhaps? Nov 11, 2019 at 0:57
• rot13(Vf guvf purzvfgel eryngrq VWXYZA = U gb B = U20?). Nov 14, 2019 at 4:40
• @TheWizard Hmm nice guess :P Nov 21, 2019 at 13:33

## 1 Answer

A number is an IJKLMN number if it's a chemical with a PubChem CID (https://pubchem.ncbi.nlm.nih.gov/compound/32032) whose structure contains some form of H-O.

• 17, is a counter-example. :/ Dec 8, 2021 at 1:36
• Sorry I'm not able to understand your explanation. Could you explain it using an example like 9 is an IJKLMN word and 17 is not? Dec 9, 2021 at 22:35
• @ThomasL This is wrong anyway because although it fits all the positives there are a few false positives but basically pubchem.ncbi.nlm.nih.gov/compound/<insertnumberhere> and see if it has an H-O. Dec 10, 2021 at 1:30