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A066986
Integers of the form (Product_{i=1..k} sigma(i))/(Product_{i=1..k} phi(i)) = A066780(k)/A001088(k).
0
1, 3, 6, 21, 189, 252, 945, 361179, 1083537
OFFSET
1,2
COMMENTS
If next term exists, it will be too large to be included.
A066780(k)/A001088(k) is an integer for k = 1, 2, 3, 4, 6, 7, 8, 14, 15, ... Is there such a k greater than 10^5 ? - Jinyuan Wang, Apr 06 2020
CROSSREFS
Sequence in context: A292066 A019053 A019054 * A096662 A236056 A347616
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Jan 27 2002
STATUS
approved