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

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A111149 Numbers n such that 5*n^2 + 9 is prime. 0
2, 4, 10, 16, 26, 28, 38, 40, 44, 46, 58, 70, 80, 82, 88, 94, 98, 110, 116, 128, 130, 136, 140, 142, 154, 164, 178, 194, 200, 208, 212, 214, 220, 224, 236, 248, 250, 254, 256, 268, 278, 284, 298, 310, 320, 322, 332, 334, 338, 362, 392, 406, 422, 424, 458, 460 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..56.

EXAMPLE

If n=154 then 5*n^2 + 9 = 118589 (prime).

MATHEMATICA

Select[Range[500], PrimeQ[5*#^2 + 9] &] (* Stefan Steinerberger, Feb 26 2006 *)

CROSSREFS

Sequence in context: A039682 A218665 A189558 * A123689 A137928 A144834

Adjacent sequences:  A111146 A111147 A111148 * A111150 A111151 A111152

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi, Oct 18 2005

EXTENSIONS

More terms from Stefan Steinerberger, Feb 26 2006

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 03:18 EST 2016. Contains 279034 sequences.