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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A141549 Numbers n whose deficiency is 12. 1
13, 45, 76, 688, 8896, 133888, 537051136 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Contribution from Jason G. Wurtzel (j_seq(AT)wurtzel.com), Aug 24 2010: (Start)

Numbers n whose abundance is -12

No other terms up to n=100,000,000 (End)

a(8) > 10^12. - Donovan Johnson, Dec 08 2011

MATHEMATICA

lst={}; Do[If[n==Plus@@Divisors[n]-n+12, AppendTo[lst, n]], {n, 10^4}]; Print[lst];

PROG

(PARI) for(n=1, 100000000, if(((sigma(n)-2*n)==-12), print1(n, ", "))) [From Jason G. Wurtzel (j_seq(AT)wurtzel.com), Aug 24 2010]

CROSSREFS

Sequence in context: A159742 A098385 A048364 * A121964 A147208 A010003

Adjacent sequences:  A141546 A141547 A141548 * A141550 A141551 A141552

KEYWORD

nonn

AUTHOR

Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 16 2008

EXTENSIONS

a(7) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Dec 08 2011

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 14 16:58 EST 2012. Contains 205635 sequences.