login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A174572 Highly abundant odd numbers: odd n such that sigma(n) is a record. 4

%I #5 Nov 05 2013 18:50:37

%S 1,3,5,7,9,13,15,21,27,33,39,45,57,63,75,93,99,105,135,165,189,195,

%T 225,255,273,285,315,399,405,441,465,495,525,585,675,693,735,765,819,

%U 825,855,945,1125,1155,1305,1365,1485,1575,1755,1785,1995,2145,2205

%N Highly abundant odd numbers: odd n such that sigma(n) is a record.

%H T. D. Noe, <a href="/A174572/b174572.txt">Table of n, a(n) for n=1..1000</a>

%t mx=0; t={}; Do[ds=DivisorSigma[1,n]; If[ds>mx, mx=ds; AppendTo[t,n]], {n,1,10^4,2}]; t

%Y Cf. A002093 (highly abundant numbers).

%K nonn

%O 1,2

%A _T. D. Noe_, Mar 24 2010

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 25 06:42 EDT 2024. Contains 371964 sequences. (Running on oeis4.)