OFFSET
1,1
COMMENTS
"Example 3: Ordinary twins 2a +- 1 for a = 2, 3, 6, 9, 15, . . . have D = 1 and are in class I. For D = 3, the twins 2a +- 3 occur for a = 4, 5, 7, 8, 10"; the latter is this sequence, from p. 3 of Weber. - Jonathan Vos Post, Feb 14 2011
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..3100
H. J. Weber, Exceptional Prime Number Twins, Triplets and Multiplets, arXiv:1102.3075 [math.NT], 2011.
MATHEMATICA
Select[Range[3, 2000], PrimeQ[# + 5] && PrimeQ[# - 5] &] / 2 (* Vincenzo Librandi, May 20 2017 *)
PROG
(Magma) [n/2: n in [3..2000] |IsPrime(n+5) and IsPrime(n-5)]; // Vincenzo Librandi, May 20 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Ray Chandler, Oct 26 2003
EXTENSIONS
Offset changed from 0 to 1 by Vincenzo Librandi, May 21 2017
STATUS
approved