OFFSET
1,1
FORMULA
EXAMPLE
For n = 5, the 5th composite is 10 = 2*5. a(5) = 2+3+4+5 = 14.
CROSSREFS
KEYWORD
nonn,less
AUTHOR
Juri-Stepan Gerasimov, Jun 15 2009
EXTENSIONS
Replaced 80 by 90 in two places, R. J. Mathar, Jun 16 2009
STATUS
approved