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4 votes
Accepted

Same sequence interwoven with itself creating groups

It is Proof
  • 16.3k
2 votes

Save now! All the digits at half the price

A bit messier than I'd like, but here goes. As other answers have noted, the doubleable PD10 numbers we want are those where Let's show that every such number can be specified by: for an overall ...
  • 24.4k
2 votes

Save now! All the digits at half the price

Other reasoning, same result:
  • 6,847
5 votes
Accepted

Save now! All the digits at half the price

Let's define some terms: Now we can begin. Let's break the problem down now. Now for the final count!
5 votes

Save now! All the digits at half the price

My guess is: First, observe that the first digit of $x$: Then, the reasoning goes this way: I'm not 100% sure of my calculus but this is how I did it:
  • 51
2 votes

How Many Magic Hexagons that use repeated digits?

Question 3 Is it possible to construct a Magic hexagon that uses repeated digits within the grid but doesn't have any repeated digits within any row columns or diagonal line?
  • 11.8k
3 votes
Accepted

How Many Magic Hexagons that use repeated digits?

Question 1 How many unique patterns are there that use repeating consecutive digits?
  • 11.8k
3 votes
Accepted

Magic Hexagon 0 + 1 to 9 twice

Edit: while preparing a complete set of possibilities I found more duplicates: Below is the original set of my 0-centre solutions, rearranged to show duplicates. These are the two pairs on the first ...
  • 11.8k
5 votes

Magic Hexagon 0 + 1 to 9 twice

Question 1: Question 2:
1 vote
Accepted

Smallest Magic Hexagon Using Repeat Digits

I believe this is the smallest value of n using the smallest digits
  • 591
4 votes

Smallest Magic Hexagon Using Repeat Digits

My answer for the least sum along any line is
  • 11.8k

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