OFFSET
1,2
FORMULA
a(n) ~ 3n. - Charles R Greathouse IV, May 25 2011
PROG
(Magma) A172182:=func<n | exists{k: k in [0..n div 6] | n in [6*k+1, 6*k+2] and not IsPrime(n)}>; [ n: n in [1..247] | A172182(n) ]; // Bruno Berselli, May 25 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Juri-Stepan Gerasimov, Jan 28 2010
EXTENSIONS
Entries checked by R. J. Mathar, May 22 2010
Retitled by Charles R Greathouse IV, May 25 2011
STATUS
approved