The people who have collaborated with them (but not with Erdős himself) have an Erdős number of 2 (11,009 people as of 2015), those who have collaborated with people who have an Erdős number of 2 (but not with Erdős or anyone with an Erdős number of 1) have an Erdős number of 3, and so forth.
Ljudi koji su surađivali sa njima (ali ne i sa samim Erdősom) imaju Erdősov broj 2 (6 984 čovjeka); oni koji su surađivali sa ljudima koji imaju Erdősov broj 2 (ali ne i sa Erdősom ili bilo kime tko ima Erdősov broj 1) imaju Erdősov broj 3, i tako dalje.