[seqfan] Primitive pairs of powerful numbers

Charles Greathouse charles.greathouse at case.edu
Sun Nov 13 07:00:32 CET 2011

Sequence A060355 has a simple proof of infinitude: each n in the
sequence generates 4n(n+1) also in the sequence.  This immediately
raises the question: are there infinitely many members not of this
form?  I recently added this as sequence A199801, primitive elements
of A060355.

Any good heuristics, if nothing else?

Charles Greathouse
Case Western Reserve University

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