OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
MATHEMATICA
Last[#]-First[#]&/@Partition[Select[Range[300], PrimeOmega[#]==3&], 4, 1] (* Harvey P. Dale, Nov 09 2012 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, Jan 22 2006
STATUS
approved