A066986 Integers of the form (Product_{i=1..k} sigma(i))/(Product_{i=1..k} phi(i)) = A066780(k)/A001088(k).

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

Links

Table of n, a(n) for n=1..9.

Crossrefs

Cf. A001088, A066780.

Sequence in context: A292066 A019053 A019054 * A096662 A236056 A347616

Adjacent sequences: A066983 A066984 A066985 * A066987 A066988 A066989

Keyword

nonn

Author

Benoit Cloitre, Jan 27 2002

Status

approved