[seqfan] What does gcd(x,y) * phi(x/gcd(x,y)) count?

T. D. Noe noe at sspectra.com
Fri Nov 20 01:02:33 CET 2009

I have seen this product of gcd and phi, but I can't remember where.  Can
someone help me?  I'll add the triangle to OEIS after I have more info
about it.



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