OFFSET
1,1
EXAMPLE
9+15+21=45, 15+21+25=61, 21+25+27=73,..
MATHEMATICA
t=Select[Range[2, 200], OddQ[#] && ! PrimeQ[#] &]; Plus @@@ Partition[t, 3, 1]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Joseph Stephan Orlovsky, Jan 07 2011
STATUS
approved