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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A168079 Numbers n such that exactly one of n+-1, n+-2 and n+-3 is prime. 0
-1, 7, 11, 13, 17, 19, 24, 25, 27, 29, 31, 33, 35, 36, 41, 43, 48, 49, 51, 52, 54, 55, 57, 59, 61, 63, 65, 66, 71, 73, 75, 77, 78, 84, 85, 87, 88, 90, 91, 92, 94, 95, 96, 101, 103, 107, 109, 114, 115, 116, 124, 125, 126, 132, 133, 135, 137, 139, 141, 142, 146, 147, 149 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..63.

FORMULA

a(n) ~ 6n/log n. -Charles R Greathouse IV, May 25, 2011

EXAMPLE

a(1)=-1 (-4,-3,-2,0 and 1 are nonprimes, 2 is prime); a(2)=7 (4,6,8,9 and 10 are nonprimes, 5 is prime); a(3)=13 (8,9,10,12 and 14 are nonprimes, 11 is prime).

CROSSREFS

Cf. A000040, A100317, A141468.

Sequence in context: A108811 A038961 A127903 * A243768 A141636 A214786

Adjacent sequences:  A168076 A168077 A168078 * A168080 A168081 A168082

KEYWORD

sign

AUTHOR

Juri-Stepan Gerasimov, Nov 18 2009

EXTENSIONS

Corrected (11, 57 inserted, 16 replaced by 126) by R. J. Mathar, Jun 04 2010

STATUS

approved

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

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

Last modified November 21 14:12 EST 2014. Contains 249779 sequences.