OFFSET
1,1
COMMENTS
Start from the prime decomposition of n, not writing down exponents which equal 1. That is the list 1, 2, 3, 2^2, 5, 2*3, 7, 2^3, 3^2, 2*5, 11, 2^2*3,.. Replace each number i in this representation by the i-th composite c(i)=A002808(i). This generates the sequence of a(n), namely c(1), c(2), c(3), c(2)^c(2), c(5), c(2)*c(3), c(7), c(2)^c(3), c(3)^c(2), c(2)*c(5), c(11), c(2)^c(2)*c(3),...
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Aug 17 2008
EXTENSIONS
Edited and corrected by R. J. Mathar, Aug 21 2008
STATUS
approved