A066765 - OEIS

A066765

Numbers k such that phi(k) < k/5.

30030, 39270, 43890, 46410, 51870, 53130, 60060, 78540, 87780, 90090, 92820, 103740, 106260, 117810, 120120, 131670, 139230, 150150, 155610, 157080, 159390, 175560, 180180, 185640, 196350, 207480, 210210, 212520, 219450, 232050, 235620

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from Harry J. Smith)

MATHEMATICA

Select[Range[250000], EulerPhi[#] < #/5 &] (* Amiram Eldar, Apr 07 2024 *)

PROG

(PARI) for(n=1, 10^8, if(eulerphi(n)<n/5, print1(n, ", ")))

(PARI) { n=0; for (m=1, 10^10, if (eulerphi(m) < m/5, write("b066765.txt", n++, " ", m); if (n==1000, return)) ) } \\ Harry J. Smith, Mar 24 2010

CROSSREFS

Cf. A000010 (phi), A091454.

Sequence in context: A184502 A285655 A074969 * A067885 A285615 A336671

Adjacent sequences: A066762 A066763 A066764 * A066766 A066767 A066768

KEYWORD

easy,nonn

AUTHOR

Jason Earls, Jan 17 2002

STATUS

approved