Journal of Number TheoryVolume 13, Issue 4, November 1981, Pages 485-494On the equation 4n = 1x + 1y + 1zAuthor links open overlay panelLi DelangShow moreShareCitehttps://doi.org/10.1016/0022-314X(81)90039-1Get rights and contentUnder an Elsevier user licenseopen archiveAbstractIt is proved that for any given positive integers N and k the number of integers n < N for which the equation 4n = 1x + 1y + 1z is unsolvable in positive integers x, y, z is not greater than cN(log N)k, where c is a constant depending only on k.Previous article in issueNext article in issueRecommended articlesCited by (0)Copyright © 1981 Published by Elsevier Inc.