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Ahnentafel Numbering System

Author: Sherry Holthe Reference Number: AA-00275 Views: 972 Created: 2013-11-07 11:08 AM Last Updated: 2014-09-25 02:13 PM 0 Rating/ Voters

Ahnentafel numbering begins with the starting individual, who is given a number of 1. From then on, an individual's father is assigned a number that is two times the number of the individual. The mother is assigned a number that is twice the individual's, plus 1.  If you are number one, your father is 2, your mother is 3, your father's father and mother are 4 and 5 and your mother's father and mother are 6 and 7 and so on. If a person is missing, their number is skipped. The child of any person always has a number that is one half the number of the father. So Ahnentafel numbers will be skipped for great-grandparents, etc. for who you have not entered information.

Because Ahnentafel number increase exponentially, they quickly become very large.  For example by the 20th generation, the Ahnentafel number would be 524,288 for a direct males line ancestor and by the 25th generation the Ahnentafel number would be 8,388,608.