# What is f(645977)?

FabianFnas
Posers and Puzzles 15 Apr '08 13:25
1. 15 Apr '08 13:25
If I say that f(347329) = 122118
Then what is f(645977)?

If you can't solve it today, I'll give you give you another f(n) tomorrow at this time.
2. 15 Apr '08 13:28
227120.1635509848011539491375612?
3. 15 Apr '08 13:52
Originally posted by FabianFnas
If I say that f(347329) = 122118
Then what is f(645977)?

If you can't solve it today, I'll give you give you another f(n) tomorrow at this time.
Is f a homomorphism?
4. 15 Apr '08 14:17
Originally posted by FabianFnas
If I say that f(347329) = 122118
Then what is f(645977)?

If you can't solve it today, I'll give you give you another f(n) tomorrow at this time.

Here is another: 420766

f(x)=x-225211

f(x)=0.351592x

5. 15 Apr '08 14:19
Originally posted by Swlabr
Is f a homomorphism?
Yes, because that will reduce it to an infinite number of possible answers ðŸ™‚
6. 15 Apr '08 15:053 edits
Originally posted by mtthw
Yes, because that will reduce it to an infinite number of possible answers ðŸ™‚
To an infinite number, or from and infinite number?
7. 15 Apr '08 15:23
Originally posted by brobluto

Here is another: 420766

f(x)=x-225211

f(x)=0.351592x

My answer was intended to be sarcastic because it probably isn't calculation with brute force what the OP wanted to get from us. There must be a simple, yet incredibly difficult to notice, regularity between the numbers given.
8. 15 Apr '08 15:29
Originally posted by kbaumen
My answer was intended to be sarcastic because it probably isn't calculation with brute force what the OP wanted to get from us. There must be a simple, yet incredibly difficult to notice, regularity between the numbers given.
I know. The poster should have been more specific.
9. 15 Apr '08 15:301 edit
Originally posted by brobluto
I know. The poster should have been more specific.
Maybe. Depends on the solution.

Anyway, I can't figure this one out.
10. 15 Apr '08 15:31
Originally posted by FabianFnas
If I say that f(347329) = 122118
Then what is f(645977)?

If you can't solve it today, I'll give you give you another f(n) tomorrow at this time.

F(645977)=244549
11. 15 Apr '08 15:49
Originally posted by Swlabr
To an infinite number, or from and infinite number?
From an infinite number to a still infinite number.
12. 15 Apr '08 15:51
Originally posted by brobluto
I know. The poster should have been more specific.
I'm sure the poster knows full well it's not specific enough. I'm assuming that the solution will be an 'elegant' function, and we weren't necessarily expected to guess it with the first number. With more numbers a pattern will probably emerge.
13. 15 Apr '08 16:08
Originally posted by brobluto

F(645977)=244549
Do not mupltiply these numbers, just look at them for positioning of the numbers.

for f(abcdef) where a,b,c,d,e,f are integers between 0 and 9

f(abcdef)=ghi

where g,h,i are integers between 10 and 99 and:

g=a*b
h=c*d
i=e*f

So, F(283749)= (2*8) (3*7) (4*9) or (16)(21)(36) or 162136

I'm sure there's probably some mathematical function or some more elegant way of explaining the relationship, but that's the pattern.
14. 15 Apr '08 16:12
Originally posted by brobluto
Do not mupltiply these numbers, just look at them for positioning of the numbers.

for f(abcdef) where a,b,c,d,e,f are integers between 0 and 9

f(abcdef)=ghi

where g,h,i are integers between 10 and 99 and:

g=a*b
h=c*d
i=e*f

So, F(283749)= (2*8) (3*7) (4*9) or (16)(21)(36) or 162136

I'm sure there's probably some mathematical function or some more elegant way of explaining the relationship, but that's the pattern.
Well this looks really elegant. Should be the intended solution. Congrats.
15. 15 Apr '08 18:36
Originally posted by brobluto
Do not mupltiply these numbers, just look at them for positioning of the numbers.

for f(abcdef) where a,b,c,d,e,f are integers between 0 and 9

f(abcdef)=ghi

where g,h,i are integers between 10 and 99 and:

g=a*b
h=c*d
i=e*f

So, F(283749)= (2*8) (3*7) (4*9) or (16)(21)(36) or 162136

I'm sure there's probably some mathematical function or some more elegant way of explaining the relationship, but that's the pattern.
Quite right. Well done brobluto!

When I saw the answer of kbaumen: "227120.1635509848011539491375612" I couldn't help a little laugh, because he was so very near, less than 1% off. I wouldn't say something because it would be a hint. For a pure guess, it was pretty well done!