|
|
A050944
|
|
Numbers k such that sigma(k) > sigma(k+1) > sigma(k+2) > sigma(k+3).
|
|
6
|
|
|
44, 104, 116, 164, 224, 272, 296, 344, 356, 464, 512, 560, 584, 620, 704, 776, 824, 836, 860, 884, 1004, 1112, 1184, 1196, 1280, 1304, 1424, 1484, 1520, 1544, 1592, 1616, 1700, 1724, 1880, 1904, 1952, 1964, 2024, 2036, 2120, 2144, 2276, 2324, 2372, 2384, 2444
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
REFERENCES
|
David Wells, The Penguin Dictionary of Curious and Interesting Numbers, entry 44.
|
|
LINKS
|
|
|
EXAMPLE
|
sigma(44)=84 > sigma(45)=78 > sigma(46)=72 > sigma(47)=48.
|
|
MATHEMATICA
|
Position[Partition[DivisorSigma[1, Range[2500]], 4, 1], _?(Max[ Differences[ #]]<0&), 1, Heads->False]//Flatten (* Harvey P. Dale, Sep 13 2020 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|