c++              138 MB    4 secs

               mem size   v5.26.0   v5.24.2   v5.22.4

infinite       7,548 MB  122 secs  119 secs  133 secs
original         704 MB  167 secs  168 secs  180 secs
improvements     744 MB   57 secs   57 secs   63 secs
optimized i2   1,543 MB   38 secs   39 secs   40 secs
2 nums into 1  1,510 MB   39 secs   40 secs   42 secs
shorter impl   1,661 MB   40 secs   42 secs   44 secs