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In this version of this article that was originally published  the authors wish to acknowledge previous work on Ramanujan's taxi-cab number. Several important references to previous work must be included and acknowledged for completeness. The purpose of this erratum is to point out the works which should have been mentioned in the introduction of our paper. In his Lost Notebook (see ), Ramanujan offered a remarkable method for finding an infinite family of solutions to X 3 + Y 3 = Z 3 + Wdoi:10.1007/s40993-017-0076-8 fatcat:bkw3hrhxpvhb5modtwvzawaxt4