OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
a(1)=0(1st nonprime)+1(2nd nonprime)=1(odd);
a(2)=1(2nd nonprime)+4(3rd nonprime)=5(odd).
MATHEMATICA
Select[Total/@Partition[Select[Range[0, 200], !PrimeQ[#]&], 2, 1], OddQ] (* Harvey P. Dale, Mar 07 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Oct 18 2009
EXTENSIONS
Entries checked by R. J. Mathar, Apr 24 2010
STATUS
approved