How to get a list of OSM relations (id numbers) of cities and countries only?

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I want to get OSM polygon shapes (GEOJson or WKT) of countries and cities only. I know that it is called a "relation" in OSM and each relation has its own id (New York is 175905, for example). How may I get a list of ids of all existing city and country relations in OSM? Is there same standard like numbers from 50.000 - 100.000 are countries and numbers from 300.000 - 500.000 are cities?

The best is to have something like a table:

OSM relation id | area name | type175905 | New York | city1403916 | France | country

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