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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147778 Positive integers of the form u*v*(u^2 - v^2) where u, v are coprime integers. 3
6, 24, 30, 60, 84, 120, 180, 210, 240, 330, 336, 504, 546, 630, 720, 840, 924, 990, 1224, 1320, 1386, 1560, 1710, 1716, 2016, 2184, 2310, 2340, 2520, 2574, 2730, 3036, 3360, 3570, 3696, 3900, 3960, 4080, 4290, 4620, 4896, 4914, 5016, 5280, 5544, 5610, 5814 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Terms with even u or v form A024365. Squarefree terms form A147779.

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

N:= 10^5:

A:= {}:

for v from 1 to floor((N/2)^(1/3)) do

   for u from v+1 do

      if igcd(u, v) = 1 then

        t:= u*v*(u^2-v^2);

        if t > N then break fi;

        A:= A union {t};

      fi

    od

od:

A;

# if using Maple 11 or earlier, uncomment the next line

# sort(convert(A, list)); # Robert Israel, Apr 06 2015

CROSSREFS

Subsequence of: A003273, A009112, A073120.

Sequence in context: A057228 A132398 A073120 * A209452 A275302 A201596

Adjacent sequences:  A147775 A147776 A147777 * A147779 A147780 A147781

KEYWORD

nonn

AUTHOR

Max Alekseyev, Nov 12 2008

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 8 18:37 EST 2019. Contains 329865 sequences. (Running on oeis4.)