

A174237


Numbers n such that 4n1 and 4n+3 are prime.


1



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
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OFFSET

1,2


LINKS



EXAMPLE

a(1)=1 because 4*11=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



KEYWORD

nonn,easy


AUTHOR



EXTENSIONS

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


STATUS

approved



