OFFSET
1,2
COMMENTS
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[700], Count[#+{-2, -1, 1, 2}, _?PrimeQ]==2&] (* Harvey P. Dale, Jan 24 2014 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Juri-Stepan Gerasimov, Nov 18 2009
EXTENSIONS
Corrected (105 inserted, 609 removed) by R. J. Mathar, Jun 04 2010
STATUS
approved