OFFSET
1,1
EXAMPLE
The first 8 composites are 4,6,8,9,10,12,14,15. 4+6+8+9+10+12+14+15 = 78 = 2*3*13. So a(8) = gcd(2*3*13, 4*6*8*9*10*12*14*15) = 6.
CROSSREFS
KEYWORD
nonn
AUTHOR
Leroy Quet, Nov 22 2007
EXTENSIONS
More terms from R. J. Mathar, Jan 13 2008
STATUS
approved