This site is supported by donations to The OEIS Foundation.

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!)
 A015822 Numbers n such that phi(n + 6) | sigma(n). 1
 6, 14, 15, 19, 22, 27, 30, 33, 38, 42, 46, 51, 56, 62, 66, 70, 78, 86, 87, 92, 102, 118, 120, 123, 138, 142, 158, 166, 177, 184, 186, 206, 210, 213, 246, 254, 262, 264, 278, 280, 282, 303, 318, 321, 326, 330, 382, 398, 411, 422, 426, 429, 446, 447, 456, 459 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..3000 MATHEMATICA Select[Range[1000], Divisible[DivisorSigma[1, #], EulerPhi[6 + #]] &]  (* David Nacin, Mar 01 2012 *) PROG (PARI) is(n)=sigma(n)%(eulerphi(n)+6)==0 \\ Charles R Greathouse IV, Sep 25 2012 CROSSREFS Sequence in context: A131902 A184998 A079010 * A023883 A230873 A192321 Adjacent sequences:  A015819 A015820 A015821 * A015823 A015824 A015825 KEYWORD nonn AUTHOR 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 .