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Carréphobic numbers with carréphylic ancestors or descendants
Carréphylic ancestors
Let 'x' be carréphobic, 'y' carréphylic and 'a' a natural number such that x = a2y ⇔ √x = a√y.
Since y is carréphylic, the approach of √x should pose no practical problems.
Here's how to find the 's' and 'p' of the rational approach of x:
s2-xp2 = 1 ⇔ s2-y(ap)2 = 1.
The fraction s/ap is the ath fraction of the set of sp-blocks of the rational approach of y, starting from the trivial block.
It is therefore the first fraction of the base-a series accelleration of the rational approach of y.
The corresponding factor '2s' is Fa or the factor of y 'base-a'.
Since √x = a√y the sp-fraction of x is a(s/ap) = s/p.

Example carréphylic ancestry
The position of a fraction indicates whether it is over or under the root-value.

The approach of √7 - carréphylic
1012358212937458212733646359071713072024535573799403114272083032257853441176011498581821153319735140881360149187423723883252902413529073881931512167704029870191380633424625649384319835130576328345472491...
01111238111417314812717522327149476520242789355443197873121923225744449566416883312547419430751408870839590270210970091999711309672081931511128987114386591174833113186990249353213130576328...
Accellerationsnumeratordenominatorfactor
base-2U(1,127)U(0,48)254
base-3U(1,2024)U(0,765)4048
base-4U(1,32257)U(0,12192)64514

The approach of √28=2√7 - carréphobic
10123451116213790127672799926105311801307274140485355940322854322571706882029452352022674592997163319736962031028176136014923883255804826819315143354080...
0111111234717241271511751992232475187651012177743196096322573835344449505455664162737131570194307257044451351109700915483608193151...

Using the above data we find that the first non trivial sp-fraction of 28 is twice the second non-trivial fraction of 7, or 127/24.
The corresponding factor 2*127 is the base-2 accelleration of the factor of 7: 162-2.

The approach of √63=3√7 - carréphylic
10123456786371798795103111119127100811351262138915161643177018972024160651808920113221372416126185282093023332257256032...
0111111111891011121314151612714315917519120722323925520242279253427893044329935543809406432257...

63 is one less than a square, so the exception mentioned in on root approach applies: 127 and 16, as rendered by the formula, are not the first non-trivial sp-block, but the second, the first being 8 and 1 because 82-63*12 = 1 satisfies the diophantine equation.
Nevertheless, trice the third non-trivial fraction of 7 is 2024/255 and the resulting series is the base-3 accelleration of the sp-series of √63.
The corresponding factor 2*2024 is the base-3 accelleration of the factor of 7: 163-3*16.

The approach of √112=4√7 - carréphobic
As it happens 112 falls outside the first 100 non-squares, so I didn't do a search, but using the above data the first non trivial sp-fraction of 112 is four times the fourth non-trivial fraction of 7, or 32257/3048.
The corresponding factor 2*32257 is the base-4 accelleration of the factor of 7: 164-4*162+2.


Carréphylic descendants
Let 'x' be carréphobic, 'y' carréphylic and 'a' a natural number such that a2x = y ⇔ a√x = √y.
Here's how to find the 's' and 'p' of the rational approach of x:
For y the first non-trivial 's' and 'p' satisfy: s2-yp2 = 1 ⇔ s2-x(ap)2 = 1 ⇔ 's' and 'ap' are the first non-trivial element of the set of sp-blocks of the rational approach of x. The corresponding factor is the same.

Example carréphylic descendency

The approach of √13 - carréphobic
The fractional approach of root 13, the first carréphobic number, as provided by Ed's straightforward program, looks like this:
101234711188310111913725639364923402989363842874936922314159233821076871310691544511778333322845101178424013037320387972147221225564523640692411971447183783713034981813977764317012746120047727923082709743130437666213147310934358493942439020...
011111235232833387110918064982910091189136925583927648529867363524283749322921591414812336408424011076041130968115433211776961332028250972438417525387673434718486855602393640199181196223111836422293032645401093435849...

As it happens, 52*13 = 325 = 182-1 and thus carréphylic. The formula renders 649/36 as the first sp-block of the approach of 5√13, making 649/180 the first sp-block of √13 with the same factor 1298.
Easy as fruitpie.
 
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