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A174237 Numbers n such that 4n-1 and 4n+3 are prime. 0
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

Table of n, a(n) for n=1..55.

EXAMPLE

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

CROSSREFS

Sequence in context: A088348 A156004 A174194 * A136244 A181580 A118754

Adjacent sequences:  A174234 A174235 A174236 * A174238 A174239 A174240

KEYWORD

nonn,easy

AUTHOR

Juri-Stepan Gerasimov, Mar 13 2010

EXTENSIONS

Corrected by Charles R Greathouse IV, Mar 18 2010

498, 708 removed, 770 and 791 inserted.... - R. J. Mathar, Mar 29 2010

STATUS

approved

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Last modified June 17 19:10 EDT 2019. Contains 324198 sequences. (Running on oeis4.)