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

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

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 * A258130 A226114 A249653

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 | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 8 02:07 EST 2016. Contains 278902 sequences.