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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A110660 Pronic numbers repeated. 4
0, 0, 2, 2, 6, 6, 12, 12, 20, 20, 30, 30, 42, 42, 56, 56, 72, 72, 90, 90, 110, 110, 132, 132, 156, 156, 182, 182, 210, 210, 240, 240, 272, 272, 306, 306, 342, 342, 380, 380, 420, 420, 462, 462, 506, 506, 552, 552, 600, 600, 650, 650, 702, 702, 756, 756, 812, 812 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

COMMENTS

a(floor(n/2)) = A002378(n);

a(n) = A028242(n) * A110654(n) = A008805(n)/2.

LINKS

Eric Weisstein's World of Mathematics, Pronic Number

FORMULA

a(n) = floor(n/2)*(floor(n/2)+1).

CROSSREFS

Cf. A109613.

Sequence in context: A028476 A179478 A051548 * A139550 A060549 A120690

Adjacent sequences:  A110657 A110658 A110659 * A110661 A110662 A110663

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 05 2005

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 15 16:39 EST 2012. Contains 205823 sequences.