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!)
A181487 Numbers n < sum( d : d|n, d<n, d not occurring before ). 2
12, 18, 20, 30, 42, 48, 56, 66, 70, 72, 78, 80, 84, 88, 90, 102, 104, 108, 114, 120, 138, 150, 162, 174, 180, 186, 192, 196, 200, 210, 220, 222, 246, 252, 258, 260, 264, 270, 272, 280, 282, 288, 294, 300, 304, 308, 312, 318, 320, 330, 336, 340, 354, 364, 366 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

This is the complement of the set S occurring in S-perfect numbers A118372.

LINKS

Donovan Johnson, Table of n, a(n) for n = 1..10000

PROG

(PARI) A181487(Nmax) = { my(C=0); for(n=2, Nmax, sumdiv(n, d, !bittest(C, d)*d)>2*n & !print1(n", ") & C+=1<<n )}

CROSSREFS

Sequence in context: A054753 A098899 A098770 * A091191 A192819 A071927

Adjacent sequences:  A181484 A181485 A181486 * A181488 A181489 A181490

KEYWORD

nonn

AUTHOR

M. F. Hasler, Oct 28 2010

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 September 19 07:45 EDT 2014. Contains 246972 sequences.