About 20 years ago, the number of groups of order 1024 was reported to be 49487365422 in ["A millennium project: constructing small groups"](https://doi.org/10.1142/S0218196702001115), and this number was repeated in other sources. Recently, Burrell showed that the actual number is 49487367289 in ["On the number of groups of order 1024"](https://doi.org/10.1080/00927872.2021.2006680). The discrepancy is explained in the latter paper.