Radar/Palindrome/Solid Frequency - Coin Community Forum

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Author	Replies: 12 / Views: 5,062
LaureateBust Valued Member Canada 331 Posts	Posted 09/19/2012 1:07 pm The recent thread about Palindrome/RADAR notes got me wondering what the relative frequencies of special serial numbers are. I decided to write a little computer program to help answer my question and I thoughts others might be interested in the results too. I was primarily interested in 7-digit palindromes (e.g. 1010101) since that was the number of digits in the $20 bill presented. I have some results that are relevant to RADAR note frequency (scarcity). The following points are true for serial number ranges such as AAA0000000 to AAA9999999: - There are only 10,000 RADARs (including 0000000) or 0.1 % for a given 3-letter prefix. This means the odds of finding any RADAR note (for a given 3-letter prefix) is 1 in 1000. - Rarity of RADAR increases with the number of unique repeating digits. The rarest is a palindrome of only one unique repeating digit, (a Solid, e.g. 1111111). The odds of finding a Solid for a given 3-letter prefix is 1 in a million (literally). - Next is a 2-digit palindrome (e.g. 1010101). There are 270 2-digit RADARs. Similarly, there are 2430 3-digit RADARs (e.g. 1232321) and 7290 4-digit RADARs (e.g. 1357531). The sum of these four types (10+270+2430+7290) = 10,000. In summary, for 7-digit serial numbers (including 0000000): Overall RADAR odds: 1:1,000 4-digit RADAR oods: 1:1,372 3-digit RADAR odds: 1:4,115 2-digit RADAR odds: 1:37,037 Solid RADAR odds: 1:1,000,000 Report this Post to the Staff

LaureateBust Valued Member Canada 331 Posts	Posted 09/19/2012 1:12 pm D'Oh!! Not surprisingly someone else has already done this: http://www.coinsandcanada.com/bank-...l-number.php Anyway, it was fun to mess around with! Report this Post to the Staff
middross Pillar of the Community Canada 695 Posts	Posted 09/19/2012 2:26 pm I was just going to provide you with that same link. lol. Report this Post to the Staff
North of 49 Pillar of the Community Canada 617 Posts	Posted 09/19/2012 7:08 pm still it's good to be reminded that coming across a radar doesn't happen that often. I regularly count around 200 bills a day and when I have the time I will scan them for radars etc. Over the years I have only found 10 or so worth keeping. Yeah they are hard to come by. Report this Post to the Staff
James4444 Valued Member United Arab Emirates 242 Posts	Posted 09/21/2012 06:11 am Thanks for sharing ... Very interesting indeed! Cheers Report this Post to the Staff
samsnate Pillar of the Community Canada 1723 Posts	Posted 09/22/2012 5:59 pm Someone want my $20 4 digit Canadian radar note? Found it a few months ago....trade it for silver! Hehe. Am I alowed to do this (MODS?) or do I need to set it up in the trade section? Dont really want to sell it but thought since the topic came up it reminded me and thought I would just throw it out there as a one time deal. Report this Post to the Staff
jakedacc Pillar of the Community Canada 1177 Posts	Posted 09/22/2012 7:04 pm why have I never seen one! Report this Post to the Staff
samsnate Pillar of the Community Canada 1723 Posts	Posted 09/22/2012 7:46 pm cuz like the OP says they are scarce. Only so many exist mathematically. Report this Post to the Staff
zzzhuge Valued Member Canada 85 Posts	Posted 09/22/2012 9:05 pm have a bill with radar#2232322 Report this Post to the Staff
samsnate Pillar of the Community Canada 1723 Posts	Posted 09/23/2012 12:16 am nice work zzzhuge. What year and denomination is it? too bad you don't have 250 posts, because I may have entertained the idea of buying it from you. Hehe. Edited by samsnate 09/23/2012 12:18 am Report this Post to the Staff
Petersun Pillar of the Community Canada 1700 Posts	Posted 09/23/2012 12:21 am zzzhuge, what's the condition? Report this Post to the Staff
samsnate Pillar of the Community Canada 1723 Posts	Posted 09/23/2012 01:00 am hey hey petersun...wait yer turn Report this Post to the Staff
zzzhuge Valued Member Canada 85 Posts	Posted 09/23/2012 7:35 pm Hi Samsnate and Petersun, The face value is $5, issue of 2006, circulation condition. Report this Post to the Staff
	Replies: 12 / Views: 5,062

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