OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..2000
MATHEMATICA
Transpose[Select[Partition[Prime[Range[9000]], 4, 1], Length[Union[ Differences[ #]]]==1&]][[4]] (* Harvey P. Dale, Aug 27 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Henry Bottomley, Apr 10 2000
STATUS
approved