login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A109358 Square root of squares of form 2*p + 3, where p is prime. 6
3, 5, 7, 11, 13, 19, 23, 25, 29, 31, 37, 41, 47, 55, 65, 67, 73, 77, 79, 91, 97, 101, 103, 109, 119, 143, 151, 155, 157, 161, 187, 197, 205, 209, 211, 221, 227, 233, 235, 239, 245, 253, 257, 263, 265, 275, 287, 289, 293, 299, 305, 307, 323, 331, 337, 349, 353 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers n such that (n^2-3)/2 is prime. - Robert Israel, Jan 22 2018

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = SQRT(A109367(n)).

MAPLE

select(t -> isprime((t^2-3)/2), [seq(n, n=1..1000, 2)]); # Robert Israel, Jan 22 2018

MATHEMATICA

Select[Table[(2Prime[n] + 3)^(1/2), {n, 7000}], IntegerQ] (* Ray Chandler, Aug 25 2005 *)

CROSSREFS

Cf. A098828, A109367.

Sequence in context: A264754 A130289 A071329 * A216285 A192862 A110589

Adjacent sequences: A109355 A109356 A109357 * A109359 A109360 A109361

KEYWORD

nonn

AUTHOR

Giovanni Teofilatto, Aug 22 2005

EXTENSIONS

Extended by Ray Chandler, Aug 25 2005

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 7 16:10 EST 2022. Contains 358667 sequences. (Running on oeis4.)