Lucas numbers

The Ghalimi scale is made of many prime numbers:

  • 147 is prime
  • 2 — 76
  • 3 — 123
  • 4199 is prime
  • 5 — 322
  • 6521 is prime
  • 7 — 843
  • 8 — 1,364
  • 92,207 is prime
  • 10 — 3,571 is prime

5 out of 10 is quite unusual, and this was first recognized by French mathematician François Édouard Anatole Lucas, who called these numbers Lucas primes. In fact, the numbers of the Ghalimi scale are nothing more than the Lucas numbers, starting with 47.


Inventory savings

Now that you have finally reached your optimum level on the Ghalimi scale, what do you do next? You start saving. And by that, I do not just mean saving money (which is certainly a good thing), but saving slots for items that you might want to acquire in the future.

For example, having reached Level 3 on the scale, I want to make sure that I never go above 123 items. As of today, I have 119 items in my inventory, which means that 4 slots are available for future items, beyond the 7 items that are part of my wishlist. These 4 slots represent my savings.

These savings are important, because they will contribute to your peace of mind. Reaching your desired level on the scale certainly required a lot of sacrifices, and you do not want to live with the constant fear of moving to the next level up. You want some padding, some margin of error, or some breathing room, and that’s precisely what you get with these savings.

When measuring one’s savings, it is usually a good idea to compute some ratio, because absolute values are not that meaningful. For example, you could compute the ratio of savings versus yearly expenses, which would tell you how many years you could live on your savings without any additional income.

In the case of the Ghalimi scale, there is no notion of income or expenses, but a useful ratio can be computed by dividing your number of available slots (4 in my case) by the number of slots in between your current level and the next level down. Level 3 is made of 123 items, while Level 2 is made of 76. Therefore there are 47 items between the two. Dividing 4 by 47 leads to a saving ratio of 8.5%. If this ratio were to reach 100%, you would have reached the next level down on the scale.

Note: 47 also happens to be the number of items for Level 1. Is that a conincidence? Definitely not. That’s because we used the golden ratio for creating our logarithmic scale. As a result, the number of items for any given level is always equal to the sum of the numbers of items for the two previous levels. In other words:

cn+1 = cn + cn-1



When you create your inventory for tabulating your level on the Ghalimi scale, make sure to include your wishlist. There are two main reasons for it: first, you do not want to reach a level that you could not sustain once you start adding new items that were on your wishlist before; second, you will want to reward yourself once you have emptied your buffer bin and generated some extra cash by selling a few of its items.

In my case, 10 out of my 123 inventory items are just being considered at this stage. 3 are pieces of furniture that I will need to acquire no matter what, but 7 are items that I really want, yet do not really need. They are what you would consider luxury items, and they should definitely be included in your list. Here is mine:

  • Drone
  • Dive computer
  • Dive Mask
  • SCUBA Regulator
  • Audiophile headset
  • Headset amplifier
  • Portable speaker

Minimalist Pilot Bag

When I was a student pilot ten years ago, my pilot bag was huge and heavy, full of manuals, maps, and approach plates. Today, thanks to the iPad, a lot of that stuff can be digitized, and you don’t need much to fly anymore. My minimalist pilot bag will be nothing more than my regular messenger bag with the following items added to it:

In order to make it easy to get all these items in my bag before a flight, I will store them in a single drawer of my tool chest. I will also attach a checklist to my headset’s bag, so that I can make sure that I have everything before leaving for the airport. Pilots love checklists!


Brooks Islington

One of my best things that I own is the Brooks Islington rucksack, because it is so versatile. By simply rolling the upper part, you can make it as big or as small as you want, which means that you can use it for many applications:

  • Primary bag when traveling (always stored in the overhead bin)
  • Biking bag (thanks to the crossing shoulder straps)
  • Hiking bag (extremely sturdy, yet light enough)
  • Grocery bag (whether walking or biking to the store)

As a result, I managed to reduce my number of bags quite a bit…



Mophie Powerstation Plus

I upgraded to a Mophie Powerstation Plus, because it has built-in cables. After some research, I decided to buy the micro USB version and this Apple Lightning adapter. That way, I can charge all my USB devices with a single battery. I also carry a separate micro USB cable that I can use to charge devices from my laptop. This cable is itself stored in the case for my Bose QuietComfort 20i headphones, since it needs to be charged on a regular basis.