Number puzzle

Here is a puzzle I heard today - It's ok

What do these numbers relate to?

1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000

x0 = 1
x1 = 2
x2 = 3

Xn = Xn-3 * 10, n > 2

What's so puzzling about it?

Originally posted by The Ewanator
Here is a puzzle I heard today - It's ok

What do these numbers relate to?

1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000

If we refer to the American financial system, is the color perhaps green...?

Originally posted by FabianFnas
If we refer to the American financial system, is the color perhaps green...?

No, not currency. There aren't, and never have been, $200 or $2000 bills, and denominations of $500, $1000 and $5000 are no longer in production.

Originally posted by FabianFnas
If we refer to the American financial system, is the color perhaps green...?

We don't issue the $2 bill anymore, and I don't think we've ever had a $200 or $2000 bill.

Originally posted by Mitsurugi
x0 = 1
x1 = 2
x2 = 3

Xn = Xn-3 * 10, n > 2

What's so puzzling about it?

If I'm reading your notation correctly:

x5 = x2 * 10
x5 = 3 * 10
x5 = 30

30 doesn't fit the pattern.

Originally posted by Mitsurugi
x0 = 1
x1 = 2
x2 = 3

Xn = Xn-3 * 10, n > 2

What's so puzzling about it?

The x2 = 3.

Originally posted by SwissGambit
We don't issue the $2 bill anymore, and I don't think we've ever had a $200 or $2000 bill.

You're correct, $200 and $2000 bills never existed. However, though rare, the $2 bill is still being issued.

Originally posted by HandyAndy
No, not currency. There aren't, and never have been, $200 or $2000 bills, and denominations of $500, $1000 and $5000 are no longer in production.

Seems to match the British currency system. Think in pence - there isn't a £5000 note, but there is a £50 note which is 5000p. Maybe it matches the US system using cents?

Originally posted by The Ewanator
Here is a puzzle I heard today - It's ok

What do these numbers relate to?

1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000

They're all factors of 10,000

don't know why 4, 8, 16, 25, 40, 80, 125 aren't listed though

Originally posted by TheMaster37
The x2 = 3.

That was obviously a typo :p

It's x2 = 5

What do these numbers relate to?

1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000

Is it that these are the numbers that the Romans had letters for?

Its a guess, hope I don't upset any rabid historians.

Phil.

Originally posted by The Ewanator
What do these numbers relate to?

1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000

Don't know what it means, but they add up to 8,888. Each group of three adds up to a multiple of 8 (8, 80, 800, 8000).

Originally posted by The Ewanator
Here is a puzzle I heard today - It's ok

What do these numbers relate to?

1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000

According to the wonderful online encyclopedia on integer sequences they are the denominations of Polish banknotes (circa 1995).
http://www.research.att.com/~njas/sequences/A051109

Originally posted by MrPhil
Is it that these are the numbers that the Romans had letters for?

Its a guess, hope I don't upset any rabid historians.

Phil.

No, that would be 1, 5, 10...