I admit this is a weird question, since it concerns a fragment of a book by an eccentric Finnish author. I would like to figure out whether this fragment does make any mathematical sense or is a total rubbish.
The author described a city in which houses are on purpose numbered only with numbers divisible by 3, 4, 5 an 7 and this is presumably due to the fact that "7 is the holy number and the numbering (I guess the author refers to the numbering of the houses) uses its various foundations and derivatives".
My guess is that the above fragment is a total gibberish and have nothing in common with real mathematics. Maybe it has something to do with numerology, but I could not find anything related in this topic as well so far. So I will be really grateful if anybody could assure me that the fragment I quoted is really mathematically meaningless.
EDIT.
The original book I am referring to is: Daniel Katz, Herra Lootin tyttäret, 1999, p. 263.
And this is the original passage I am refering to (the last sentence is the most important):
Katujen nimet muuttuvat kesken kaiken ja eri puolilla katua voi olla eri nimet. Numerotkin heittävät uskomattomasti. Täällä meillä on käytössä parillis-pariton-systeemin lisäksi kolmella jaolliset luvut ja neljällä, viidellä, jopa seitsemällä jaolliset, sillä seitsemän on somoralaisten pyhä luku ja niinpä seitsemän eri fundamentit ja niistä johdetut luvut ovat myös käytössä talojen numeroimisessa.
So I hope this will enable someone with command of Finnish language to provide a decisive answer to the question.