OFFSET
1,1
EXAMPLE
The nonprimes: 1,4,6,8,9,10,12,14,15 ..., product of consecutive nonprimes: 4,24,48,72,90,...
MATHEMATICA
With[{nonps=Complement[Range[100], Prime[Range[PrimePi[100]]]]}, Times @@@ Partition[nonps, 2, 1]] (* Harvey P. Dale, Jan 16 2012 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Felix Tubiana, Feb 11 2004
EXTENSIONS
Definition clarified by Harvey P. Dale, Jan 16 2012
STATUS
approved