Hi,
Here is a new pattern I found in the number arrays that is quite cool I think!
ie number array 5:
0 10 1 9 2 8 3 7 4 6 5 5That number array has two prime pairs 3,7 and 5,5
The offset from the last row of the number array to these prime pairs is 2 for 3,7 and 0 for 5,5 which makes a sequence 2,0
This sequence (call it the "prime pair gap sequence") has one prime, 2.
Ok so that seems meaningless BUT.. here is the new pattern..
for number arrays that are multiples of 30, ie number arrays
30,60,90,120... guess what?!These number arrays have the most primes in their "prime pair gap sequences" of any other number arrays by a large margin, and as the number array size increases by a multiple of 30, the margin of increased primes seems to go up too compared to other number arrays of similar size.
ie
number array 30:
0 60 1 59 2 58 3 57 4 56 5 55 6 54 7 53 primepair 8 52 9 51 10 50 11 49 12 48 13 47 primepair 14 46 15 45 16 44 17 43 primepair 18 42 19 41 primepair 20 40 21 39 22 38 23 37 primepair 24 36 25 35 26 34 27 33 28 32 29 31 primepair 30 30Ok so you can see that based on the left column, the primepairs seem to occur at 7,13,17,19,23,29 no big deal right?
BUT GUESS WHAT!?
If you could from the bottom like this:
30 0 60 29 1 59 28 2 58 27 3 57 26 4 56 25 5 55 24 6 54 23 7 53 primepair 22 8 52 21 9 51 20 10 50 19 11 49 18 12 48 17 13 47 primepair 16 14 46 15 15 45 14 16 44 13 17 43 primepair 12 18 42 11 19 41 primepair 10 20 40 9 21 39 8 22 38 7 23 37 primepair 6 24 36 5 25 35 4 26 34 3 27 33 2 28 32 1 29 31 primepair 0 30 30Now the prime pairs, when counted using the leftmost reversed column, occur at:
1,7,11,13,17,23and 5 of 6 of these are primes.
This pattern of reversible prime occurrence in the primepairs occurs for multiples of 30 number arrays, so the next big pattern is for number array 60.
Here are the reversed prime pair patterns for some of the multiples of 30:
number array 30 (5 primes out of 6 numbers):
7,13,17,19,23,29number array 60 (10 primes out of 12 numbers):
7,11,13,17,19,23,31,37,41,47,53,59number array 90 (12 primes out of 14 numbers):
7,13,17,23,29,31,41,43,53,67,71,73,79,83number array 120 (16 primes out of 18 numbers):
7,11,13,17,29,41,43,47,59,61,67,73,83,89,101,103,109,113number array 210 (26 primes out of 30 numbers):
11,19,23,31,37,41,47,53,61,67,71,73,83,89,103,107,109,113,127,137,139,149,151,157,163,179,181,191,193,197number array 420 (38 primes out of 51 numbers):
11,13,17,19,29,31,43,53,67,71,79,83,89,97,101,107,113,131,139,149,157,163,167,179,181,193,197,199,223,227, 233,239,241,263,269,271,277,283,293,317,331,337,349,353,373,379,383,397,401,409,419Here is a spreadsheet showing this stuff for number arrays up to 499, I put the "60 example" in there on the right of the spreadsheet highlighted in yellow.
There might be patterns like this for primorial multiples like multiples of 210 etc I think, but haven't checked yet.
Link to the spreadsheet:
cheers, Jamie