OFFSET
0,2
COMMENTS
The sequence A002808 is extended with A002808(0)=0 to define "composite" here. Every term occurs in A001744. - R. J. Mathar, Aug 28 2007
FORMULA
EXAMPLE
a(7) = 84, composite (7) =14, term corresponding to 14 is 84.
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Nov 07 2005
EXTENSIONS
Corrected and extended by R. J. Mathar, Aug 28 2007
STATUS
approved