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

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A173295 Primes of the form n^2+n+1 or n^2+n+9. 0
3, 7, 11, 13, 29, 31, 43, 73, 157, 191, 211, 241, 281, 307, 389, 421, 463, 601, 659, 757, 821, 1123, 1483, 1723, 1901, 2459, 2551, 2971, 3089, 3307, 3541, 3907, 4423, 4831, 5113, 5701, 5861, 6007, 6163, 6329, 6481, 7841, 8011, 8191, 9901, 10303, 11131 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..47.

EXAMPLE

a(1)=3 because 1^2+1+1=3 is prime, a(3)=11 because 1^2+1+9=11 is prime.

MATHEMATICA

Union[Select[Flatten[Table[n^2+n+{1, 9}, {n, 200}]], PrimeQ]] (* Harvey P. Dale, Aug 28 2012 *)

CROSSREFS

Cf. A002378, A173288.

Sequence in context: A111363 A193258 A114273 * A191040 A074336 A086475

Adjacent sequences:  A173292 A173293 A173294 * A173296 A173297 A173298

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Feb 15 2010

EXTENSIONS

Added 3, removed 133, replaced 607 by 601 - R. J. Mathar, Feb 24 2010

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 11 19:09 EST 2017. Contains 295919 sequences.