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

 

Logo

Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A110597 Balanced numbers (A020492) = 1 mod 12. 0
1, 1045, 29029, 50065, 64285, 87685, 1390753, 2011009, 3189625, 7711405, 39298441, 53238625, 68393065, 75416341, 96345613, 225938245, 228404605, 231562825, 233591605, 279999445, 458406445, 462027565, 470527057, 491291125, 513574369, 663605761, 666373825 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

For the first 27 terms, the quotient sigma(n)/phi(n) is 1, 2 or 3.

LINKS

Table of n, a(n) for n=1..27.

MAPLE

with(numtheory); BNM1:=[]: for z from 1 to 1 do for m from 0 to 500000 do n:=12*m+1; if sigma(n) mod phi(n) = 0 then BNM1:=[op(BNM1), n] fi; od; od; BNM1;

PROG

(PARI) forstep(n=1, 1e5, 12, if(sigma(n)%eulerphi(n)==0, print1(n", "))) \\ Charles R Greathouse IV, Nov 27 2013

CROSSREFS

Cf. A000010, A000203, A020492, A062699.

Sequence in context: A224604 A045027 A023067 * A226114 A056092 A236273

Adjacent sequences:  A110594 A110595 A110596 * A110598 A110599 A110600

KEYWORD

nonn

AUTHOR

Walter Kehowski, Sep 13 2005

EXTENSIONS

a(10)-a(27) from Donovan Johnson, Aug 30 2012

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 July 23 14:28 EDT 2014. Contains 244868 sequences.