towerator wrote:A rake!
Not too surprisingly for this rule, that rake can be adjusted to make a breeder:
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x = 29, y = 9, rule = 24567/345678/5
5.A$2.DC3A.DA13.DB.CA$.D.B6A.DCDCBCBABA.7A$3.3AD16AB5A$3.3ADA.16A.CA$
.11ADB.CADB.CADBA$.7A.CA$5ADBA$2.CA!
There's a p2 head attached to a p6 body attached to a p228 tail -- not sure if I'm missing another multipler or two in the middle there... The tail puffs out rakes that interact with each other in various improbable ways to produce a growing triangle of p456 backward ships.
But there's certainly no shortage of quadratic-growth objects in this rule -- e.g.,
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#C puffer produces growing horizontal lines
x = 6, y = 19, rule = 24567/345678/5
.4A$2.3AC$.ACDBA$2ACDCA$B2ADBD$DAD2AB$C5A$BABA$4AC$.C3A$.BDAD$D3AB$B
4A$.2A$C2AC$4A$D2AD$B2AB$4A!
or even this dense-smoke-maker, where the oblique leading edge seems to get inexorably longer:
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x = 37, y = 23, rule = 24567/345678/5
2$3A$4A.DA$AC5A5.DA$2A2CAB2ACAB4A.BA$D2AC3ACA.9ACBA$D5A2CAD2A.ADAB5A
2D.DCADBA$DC29A$.B5AB3ADAC6AD5ABAC2A$.4ACAB3ADAC3A.2ADA.3AB4A$A.AB26A
$5AC.ADAB4A.C2ABACAD3ADBA$AC3AD.ADAB3AD.D2ABAC4A$ACAC.D9A.10A$2ABD5A.
ACAB6ADB.CA$.CAB5A.6A.CA$D2.DAB7ADBA$3.D5A.CA$4.2ADBA!
As usual (I think) for Brian's-Brain-ish rules, if most things are flying around at half the speed of light or more, the problem is going to be finding anything stable enough to build any kind of logic circuitry out of. So far I've only seen one p10 oscillator, generated by this p64 puffer --
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x = 261, y = 14, rule = 24567/345678/5
243.2ADB.CA3.CA3.CA$218.D.D15.CD2A.CD8ADB3ADB3A$220.D15.D2AD2B3.7A.4A
.3A$43.ABC30.ADB28.CD31.2AD29.ABA28.ABC29.C4AC2AB3A.B.11A$43.C3A28.D
2AC29.3A28.3A29.B3A28.C3A28.D5A2DA2C2A.3ADA.3AB2A$4.ABCDADBA31.3AC28.
C2AD28.3A30.3A28.3AB28.3AC28.2A.AB6AB2.3ADA.5A$.DA.9A31.CBA28.BDA31.D
C28.D2A29.ABA30.CBA28.4A3B3ABCD.D10A$5A2CA3B3ACBA218.D8A2.C2.DB3ADB.C
A$DA2B4A2B8ADBA215.C2ACD10.CA$.B4A3B5AB6A.CADBA$2.2A.5A.D4ACAD8A$6.CB
A3.2C2AC10A$14.DB3ADB.CADBA$16.CA!
-- and it doesn't seem to be stable enough to survive anything bumping into it.
Has anyone seen a larger oscillator, or is there a way of engineering one? Otherwise the likely way to get something to stand still would be to bounce some prolific moving object off of copies of itself, maybe in a square, along the lines of Bill Gosper's original plan for a p30 glider gun.