|View static image|
|Number of cells||177|
|Bounding box||74 × 60|
|Discovered by||Maia Karpovich|
|Year of discovery||2015|
Sawtooth 177 is a refinement of Sawtooth 181 obtained by rephasing the constituent guns. It is the smallest known sawtooth in terms of its minimum repeating population of 177. A bounding-box-optimized variant, Sawtooth 195, has a repeating population of 195 and a bounding box of 62 × 56, significantly smaller than the previous 79 × 55 record set by Sawtooth 201. By removing the 2 gliders, making all the blocks pre-blocks, and making the pentadecathlon 10 cells in a row, it is possible to make a sawtooth that has 152 cells, but the minimum repeating population is still 177.
The sawtooth functions by letting two glider streams of period 120 retract a block, created by collision with a spark from a 58P5H1V1, one cell at a time. The retracted block is deleted via interaction with a pentadecathlon, and the streams are allowed to return to the now-farther-away 58P5H1V1 to create another block.
The population is equal to 177 at generations 15, 6975, 849135, 102750495, 12432815055, ..., 58 (121n − 1) + 15, ..., giving an expansion factor of 121.