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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] (*Chandler*)

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

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Last modified October 22 18:55 EDT 2018. Contains 316500 sequences. (Running on oeis4.)