perplexus.info :: Just Math : Compositeness of Sum of Cubes

Compositeness of Sum of Cubes (Posted on 2025-05-03)

Prove that the number 512³+675³+720³ is composite.

No Solution Yet Submitted by Danish Ahmed Khan

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direct calculation

| Comment 1 of 2

>> 512^3+675^3+720^3

ans =

815012603

>> factor(ans)

ans =

229 467 7621

so 512^3 + 675^3 + 720^3 = 229 * 467 * 7621

Posted by Charlie on 2025-05-04 07:17:59

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