login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A209835 Smallest k=>0 such that 2k+(n-th average of twin prime pairs) is oblong number. 0
1, 0, 0, 1, 0, 0, 6, 0, 4, 1, 9, 3, 1, 9, 6, 6, 0, 1, 12, 15, 16, 0, 15, 0, 15, 15, 0, 16, 4, 21, 1, 24, 21, 6, 24, 18, 12, 3, 30, 15, 19, 15, 27, 21, 15, 6, 27, 15, 0, 36, 16, 10, 27, 12, 0, 9, 10, 7, 24, 15, 36, 21, 40, 37, 25, 16, 10, 9, 42, 21, 6, 34, 0, 30, 49, 34, 22, 13, 36, 30, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

COMMENTS

Averages of twin prime pairs of the form n(n+1): 6, 12, 30, 42, 72, 240, 420, 462, 600, 1482, 1722, 2550, 2970, 3540, 4422, 8010, 10302, 17292, 19182, 20022, 23562, 24180, 27060, 31152... , multiples of 6 as stated in A002822.

LINKS

Table of n, a(n) for n=1..81.

CROSSREFS

Cf. A002378, A014574.

Sequence in context: A019766 A094830 A196878 * A298528 A021947 A073010

Adjacent sequences:  A209832 A209833 A209834 * A209836 A209837 A209838

KEYWORD

nonn

AUTHOR

Gerasimov Sergey, Mar 14 2012

EXTENSIONS

Corrected by R. J. Mathar, Mar 15 2012

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 January 23 04:16 EST 2020. Contains 331168 sequences. (Running on oeis4.)