My banknotes with the highest coolness factor in relation to the serial number would be my CU $50's with the serial numbers 78888888 and 78888887.

The message from Cool Numbers reads ''Congratulations! You have found an extremely cool number! It has a Universal Coolness Index of 99.51% in relation to the seven in a row, and the super radar gets only 99.47%''.

The website goes on to say ''78888888 contains a 7-of-a-kind together. Only 0.00018% of 8-digit numbers have this combination''. It unfortunately doesn't say how likely the note is to be found crisp out of the bank strap. That might boost the rating up a notch or two. Here is the video I made:

My last purchase, a solid instead of a error note. This is a 99.77% coolness index, I would think that since it's a Web, maybe it should go up to 99.78% C/I.

Congratulations! You have found an extremely cool number! It has a Universal Coolness Index of 99.24%

19111911 contains a 6-of-a-kind and 1 pair. Only 0.0025% of 8-digit numbers have this combination.

19111911 has 2 unique digits. In 0.011% of 8-digit numbers, there are 2 or fewer unique digits.

All of the digits in 19111911 are odd! Only 0.39% of 8-digit numbers have this property.

19111911 contains 1 triple and 1 pair together. Only 1.5% of 8-digit numbers have this combination.

19111911's digits sum to 24. In 8.0% of 8-digit numbers, the digits sum to at most 24.

...and it is also represents the Colt 1911!

Congratulations! You have found an extremely cool number! It has a Universal Coolness Index of 99.45%

11011011 contains a 6-of-a-kind and 1 pair. Only 0.0025% of 8-digit numbers have this combination.

11011011's digits sum to 6. In 0.0030% of 8-digit numbers, the digits sum to at most 6.

11011011 is a palindrome! Only 0.010% of 8-digit numbers are palindromes.

11011011 has 2 unique digits. In 0.011% of 8-digit numbers, there are 2 or fewer unique digits.

11011011 contains 3 pairs together. Only 0.75% of 8-digit numbers have this combination.

oih82w8 = "Oh I Hate To Wait" "I tell her coins keep me off the streets and out of the bars." Moe145 "WOO-SAA...WOo-SAa...Woo-Saa" (calm down) "An individual who vacillates when there is need of action will find themself beyond the hope of future success."

All right, my apologies. You were looking for "almost but not quite" notes, and I completely missed the website that ranks coolness. How about this "almost a ladder":

Quote: This is a very cool number! It has a Universal Coolness Index of 98.3%. 09876500 contains a backwards run of 5. In 0.023% of 8-digit numbers, there are backwards runs of 5 or longer.

Or this "not quite a low serial number star":

Quote: This is a very cool number! It has a Universal Coolness Index of 97.0%. 00001373's digits sum to 14. In 0.32% of 8-digit numbers, the digits sum to at most 14. 00001373 contains a 4-of-a-kind together. Only 0.46% of 8-digit numbers have this combination. 00001373 contains a 4-of-a-kind and 1 pair. Only 2.6% of 8-digit numbers have this combination. 00001373 is a prime number! Only 5.8% of 8-digit numbers are prime. 00001373 has 4 unique digits. In 9.3% of 8-digit numbers, there are 4 or fewer unique digits.

[Sadly, it won't let me enter the star to see if that adds to the coolness or not.]

My Coin & Currency Collection (Dansco 7070 and 8100 albums, Proof Type Set, U.S. Currency Type Set & Foreign Bullion Collection)

As Coinfrog said; What if the note has 6 or 7 numbers. When I entered 000666, it added 2 more zeros, becoming 00000666. The coolness index is 99.51% on the 8 digit number. Is it the same on 6 digits?

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