mathythrowaway

2 ms·

1. 1.▲
   by mathythrowaway 8y ago

   But that does produce a picture identical to theirs. Because they are using 75 numbers per square, they do end up hitting at least one prime in each box with (n,k)=1 for the first 75 rows. This pattern won't continue much longer, which
2. 2.▲
   by mathythrowaway 8y ago

   No, it isn't plotting a prime spiral. Each square in their triangle is a block of 75 numbers. Within the nth row the numbers are sorted by residue mod n.
3. 3.▲
   by mathythrowaway 8y ago

   Their picture is correct, but only because they are doing something more ridiculous than this. Every one of the squares in their picture represents 75 numbers, not 5 numbers.
4. 4.▲
   by mathythrowaway 8y ago

   This just shows the reduced residues mod n. There are n squares in the nth row from the top. Color the kth square of the nth row black if gcd(k,n)=1, color it red otherwise.