Wiki
Wiki

Research notes on every problem, and a library of the papers behind them. Built from the open erdos repository.

Updated


Claim. Theorem 1 of J. She, Nonexistence of consecutive powerful triplets around cubes with prime-square factors, Integers 25 (2025), Paper No. A103: there are no consecutive powerful numbers x3−1=p2a3x^3-1=p^2a^3, x3x^3, x3+1=q2b3x^3+1=q^2b^3 with p,qp,q prime and a,b,xa,b,x integers. Corollary 1 of the paper: for primes p,qp,q and integers x,ax,a with a≠0a\neq0, the equation x6−1=p2q2a3x^6-1=p^2q^2a^3 has no solution. The proof is a case analysis on the common factors of x∓1x\mp1 and x2±x+1x^2\pm x+1, using the 33-adic valuation, Thue equations and the integer points of the Mordell curve y2=x3−432y^2=x^3-432 (card). The page is dated by the arXiv posting of 2025-07-07; the journal published the paper on 2025-11-25.

Covers. Triples centered at a cube whose outer members are both a prime squared times a cube, a partial no to the question of Problem 364. Triples of other shapes, and those whose middle member is not a cube, are untouched.

Acceptance. Refereed in Integers (received 2025-07-09, accepted 2025-10-22): the refereed evidence. The site labels the problem VERIFIABLE, an open label, so its commentary's mention of the paper is not reviewed evidence.