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We give an explicit formula for the value of Castelnuovo\u2013Mumford regularity for their ordinary powers. Moreover, we compare the <jats:italic>m<\/jats:italic>-th symbolic and ordinary powers for such ideals in order to show whenever the <jats:italic>m<\/jats:italic>-th symbolic defect is non-zero.\n<\/jats:p>","DOI":"10.1007\/s10998-023-00531-8","type":"journal-article","created":{"date-parts":[[2023,6,5]],"date-time":"2023-06-05T13:02:36Z","timestamp":1685970156000},"page":"508-519","update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Regularity and symbolic defect of points on rational normal curves"],"prefix":"10.1007","volume":"87","author":[{"given":"Iman Bahmani","family":"Jafarloo","sequence":"first","affiliation":[]},{"given":"Grzegorz","family":"Malara","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2023,6,5]]},"reference":[{"issue":"1","key":"531_CR1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1007\/BF01389151","volume":"87","author":"D Bayer","year":"1987","unstructured":"D. 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