login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A066813 LCM(phi(n),phi(n+1)). 5
1, 2, 2, 4, 4, 6, 12, 12, 12, 20, 20, 12, 12, 24, 8, 16, 48, 18, 72, 24, 60, 110, 88, 40, 60, 36, 36, 84, 56, 120, 240, 80, 80, 48, 24, 36, 36, 72, 48, 80, 120, 84, 420, 120, 264, 506, 368, 336, 420, 160, 96, 312, 468, 360, 120, 72, 252, 812, 464, 240, 60, 180, 288, 96 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Harry J. Smith, Table of n, a(n) for n=1,...,1000

MATHEMATICA

LCM@@EulerPhi[#]&/@Partition[Range[100], 2, 1] (* Harvey P. Dale, May 07 2011 *)

PROG

(PARI) { for (n=1, 1000, write("b066813.txt", n, " ", lcm(eulerphi(n), eulerphi(n+1))) ) } [From Harry J. Smith, Mar 29 2010]

CROSSREFS

Sequence in context: A128745 A188524 A126064 * A033732 A033752 A059886

Adjacent sequences:  A066810 A066811 A066812 * A066814 A066815 A066816

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Jan 20 2002

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified November 23 04:44 EST 2014. Contains 249839 sequences.