1. Joined
    11 Nov '05
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    43938
    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. Sigulda, Latvia
    Joined
    30 Aug '06
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    4048
    15 Apr '08 13:28
    227120.1635509848011539491375612?
  3. Joined
    26 Nov '07
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    1085
    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. Joined
    04 Oct '06
    Moves
    11845
    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.
    Not enough info for definite answer. kbaumen had one.

    Here is another: 420766

    f(x)=x-225211

    or in kbaumen's answer:

    f(x)=0.351592x

    There's other answers as well.
  5. Joined
    07 Sep '05
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    35068
    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 🙂
  6. Joined
    26 Nov '07
    Moves
    1085
    15 Apr '08 15:053 edits
    Originally posted by mtthw
    Yes, because that will reduce it to an infinite number of possible answers 🙂
    To an infinite number, or from and infinite number?
  7. Sigulda, Latvia
    Joined
    30 Aug '06
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    4048
    15 Apr '08 15:23
    Originally posted by brobluto
    Not enough info for definite answer. kbaumen had one.

    Here is another: 420766

    f(x)=x-225211

    or in kbaumen's answer:

    f(x)=0.351592x

    There's other answers as well.
    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. Joined
    04 Oct '06
    Moves
    11845
    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. Sigulda, Latvia
    Joined
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    4048
    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. Joined
    04 Oct '06
    Moves
    11845
    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.
    The answer is:

    F(645977)=244549
  11. Joined
    07 Sep '05
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    35068
    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. Joined
    07 Sep '05
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    35068
    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. Joined
    04 Oct '06
    Moves
    11845
    15 Apr '08 16:08
    Originally posted by brobluto
    The answer is:

    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. Sigulda, Latvia
    Joined
    30 Aug '06
    Moves
    4048
    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. Joined
    11 Nov '05
    Moves
    43938
    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!
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