login
A174011
4*prime(n)-+3 are both prime.
2
1, 3, 5, 8, 17, 24, 29, 35, 36, 67, 72, 77, 79, 85, 95, 98, 105, 109, 145, 160, 171, 175, 189, 204, 207, 215, 221, 230, 263, 271, 286, 321, 326, 327, 335, 364, 410, 444, 458, 487, 495, 501, 511, 541, 551, 580, 585, 633, 638, 651, 654, 681, 691, 708, 729, 735
OFFSET
1,2
LINKS
EXAMPLE
a(1)=1 because 4*prime(1)-3=5=prime and 4*prime(1)+3=11=prime; a(2)=3 because 4*prime(3)-3=17=prime and 4*prime(3)+3=23=prime.
MATHEMATICA
Select[Range[800], And@@PrimeQ[4 Prime[#]+{3, -3}]&] (* Harvey P. Dale, Dec 09 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Corrected (24 inserted, 104 replaced by 105, 114 removed etc.) by R. J. Mathar, Apr 28 2010
STATUS
approved