A164347 - OEIS

A164347

The n-th term is the minimum number x such that x/Totient(x) >= n.

2, 2, 6, 30, 210, 30030, 223092870, 13082761331670030, 3217644767340672907899084554130

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OFFSET

1,1

COMMENTS

These numbers are all primorials. Primorials necessarily must be the minimum terms in this sequence (given the nature of Euler's Totient function).

Essentially the same as A091456. - R. J. Mathar, Aug 17 2009

LINKS

EXAMPLE

2 => 2/totient(2) = 2 (so it is both the first and 2nd entry of the sequence).

30 => 30/totient(30) = 15/4 >= 3.

210 => 210/totient(210) = 210/48 >= 4.

CROSSREFS

Each number n in this sequence is of the form: primorial(x). A164348, the related sequence, contains the x's.

KEYWORD

easy,nonn

AUTHOR

STATUS

approved