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# Blog

2017-12-18

## Christmas card 2017

Showing all comments about the post Christmas card 2017. To return to the blog post, click here.

### Comments

Comments in green were written by me. Comments in blue were not written by me.
@Jose: There is a mistake in your answer: 243 (0100000) is the number of numbers between 10,000 and 100,000 that do not contain the digits 0, 1, 2, 3, 4, 5, or 6.
Matthew

Thanks for the puzzle!
Is it possible that the question 9 is no correct?
I get a penguin with perfect simetrie except at answer 9 : 0100000 that breaks the simetry.
Is it correct or a mistake in my answer?
Thx
Jose

@C: look up something called Frobenius numbers. This problem's equivalent to finding the Frobenius number for 14 and 29.
Lewis

I can solve #2 with code, but is there a tidy maths way to solve it directly?
C

My efforts were flightless.
NHH

What a fun diversion! I have to admit I can't remember how to solve #2 - I finally had to write some code. (So primitive.)
Heather

@Matthew: Thank you for the clarification!

I don't want to spoil the answer for anyone, but my Christmassy picture looks like a well dressed bird.
Claudio

@Claudio: The page number at the end of the book is 116.
Matthew

Is that a book with 116 2 sided sheets, or is the page number at the end of the book 116?
Claudio

@HH: Nope, I mean questions 6, 7 and 8. The question refers to itself.
Matthew

For question 8, don't you mean "questions 6 and 7"?
HH

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