Infinite growth 7-segment integers (variable width)

[pcallahan]

dvgrn pointed out that my 7-segment display characters were using fixed width, causing 1 to be spaced farther from other digits than needed. That was intentional, since it's how old 7-segment displays really work, but I adapted the code to get integers with compressed spacing and ran them for infinite growth up to a million. At least two of these are known. 154299 due to Dean Hickerson, and 140732 (infinitegrowth wordpress blog, author unknown). 832021 and its mirror image 835051 both produce infinite gliders.

140732

Code: Select all

x = 21, y = 5, rule = B3/S23
obobob3ob3ob3ob3o$obobobobo3bo3bo3bo$ob3obobo3bob3ob3o$o3bobobo3bo3bobo$o3bob3o3bob3ob3o!

154299

Code: Select all

x = 21, y = 5, rule = B3/S23
ob3obobob3ob3ob3o$obo3bobo3bobobobobo$ob3ob3ob3ob3ob3o$o3bo3bobo5bo3bo$ob3o3bob3ob3ob3o!

367021

Code: Select all

x = 21, y = 5, rule = B3/S23
3ob3ob3ob3ob3obo$2bobo5bobobo3bobo$3ob3o3bobobob3obo$2bobobo3bobobobo3bo$3ob3o3bob3ob3obo!

601986

Code: Select all

x = 21, y = 5, rule = B3/S23
3ob3obob3ob3ob3o$o3bobobobobobobobo$3obobobob3ob3ob3o$obobobobo3bobobobobo$3ob3obob3ob3ob3o!

832021

Code: Select all

x = 21, y = 5, rule = B3/S23
3ob3ob3ob3ob3obo$obo3bo3bobobo3bobo$3ob3ob3obobob3obo$obo3bobo3bobobo3bo$3ob3ob3ob3ob3obo!

835051

Code: Select all

x = 21, y = 5, rule = B3/S23
3ob3ob3ob3ob3obo$obo3bobo3bobobo3bo$3ob3ob3obobob3obo$obo3bo3bobobo3bobo$3ob3ob3ob3ob3obo!

979374

Code: Select all

x = 23, y = 5, rule = B3/S23
3ob3ob3ob3ob3obobo$obo3bobobo3bo3bobobo$3o3bob3ob3o3bob3o$2bo3bo3bo3bo3bo3bo$3o3bob3ob3o3bo3bo!

986109

Code: Select all

x = 21, y = 5, rule = B3/S23
3ob3ob3obob3ob3o$obobobobo3bobobobobo$3ob3ob3obobobob3o$2bobobobobobobobo3bo$3ob3ob3obob3ob3o!

I also tried padding with leading zeros and that does not produce additional infinite growth patterns.

[pcallahan]

I was also curious about infinite growth in the decimal expansion of π, which I know is useless and arbitrary (and too early even for π-day this year but I can't wait).

64715509 is 8 digits starting at position 4386 in the decimal expansion of π. You can verify here.

Code: Select all

x = 29, y = 5, rule = B3/S23
3obobob3obob3ob3ob3ob3o$o3bobo3bobobo3bo3bobobobo$3ob3o3bobob3ob3obobo
b3o$obo3bo3bobo3bo3bobobo3bo$3o3bo3bobob3ob3ob3ob3o!

The six-digit infinite growth numbers show up in the first half million or so digits, but that is unsurprising. I increased the window to find something earlier. After 8 digits, going up to 50, nothing else shows up at 4386 or earlier except extensions of the 8 digits. At this point, they become hard to draw manually, so I think 64715509 is a good place to stop. I may keep looking for a longer one though.