Lidka

Lidka
x = 9, y = 15, rule = B3/S23 bo$obo$bo8$8bo$6bobo$5b2obo2$4b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
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Pattern type	Methuselah
Number of cells	13
Bounding box	9 × 15
MCPS	21
Lifespan	29055 generations
Final population	1623
L/I	2235
F/I	124.8
F/L	0.056
L/MCPS	1383.6
Discovered by	Andrzej Okrasinski David Bell
Year of discovery	2005
Glider synthesis Fewest gliders (cheapest variant) 6 Uploaded synthesis RLE lidka_synth.rle
Pattern files Plaintext lidka.cells RLE lidka.rle

Lidka is a methuselah that was originally found in the 15-cell form shown below by Andrzej Okrasinski, which has a lifespan of 29053 generations. The 13-cell grandparent with lifespan 29055 shown to the right was soon after found by David Bell. Simon Ekström identified a 13-cell predecessor with a 9×6 bounding box and a lifespan of 29126 on March 8, 2017.

Incidentally, the 9-cell pattern in the lower right corner of this pattern, fitting in a 5×5 bounding box, is also a methuselah in its own right: it stabilizes after 595 generations to a constellation of 182 cells.

Stable pattern

The stable pattern that results from Lidka has 1623 cells and consists of 135 blinkers (including seven traffic lights, three Interchanges), 102 blocks, 57 beehives (including two honey farms), 28 gliders, 18 loaves, 15 boats, six ships, five ponds, two tubs, two ship-ties in the form of a fleet, one toad, one beacon, and one long boat.

Generation 29055

Image gallery

• 

  Simon Ekström's 29126-generation version of Lidka

• 

  Generation 2 of Lidka is the form in which it was originally found

See also

• List of long-lived methuselahs

External links

• Lidka at the Life Lexicon

• Lidka minus tub ash at Adam P. Goucher's Catagolue (pseudo-object)

• Methuselah Lidka improved (discussion thread) at the ConwayLife.com forums
• New Record Methuselah at Game of Life News
• Andrzej Okrasinski's Game of Life page describing the discovery