A174237 - OEIS

A174237

Numbers n such that 4n-1 and 4n+3 are prime.

1, 2, 5, 11, 17, 20, 26, 32, 41, 56, 77, 95, 110, 116, 122, 125, 161, 185, 206, 215, 221, 227, 242, 272, 320, 326, 356, 362, 371, 392, 395, 416, 446, 467, 500, 521, 551, 560, 587, 635, 665, 671, 677, 755, 770, 791, 797, 830, 836, 866, 962, 977, 980, 986, 1001

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

EXAMPLE

a(1)=1 because 4*1-1=3 and 4*1+3=7 are prime.

MATHEMATICA

Select[Range[1100], AllTrue[4#+{3, -1}, PrimeQ]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jan 28 2021 *)

CROSSREFS

Sequence in context: A088348 A156004 A174194 * A181580 A118754 A140559

Adjacent sequences: A174234 A174235 A174236 * A174238 A174239 A174240