OFFSET
1,1
EXAMPLE
a(1)=3 because (100,010,001) where semiprime(1)=3=100 (in base 2).
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Juri-Stepan Gerasimov, Jun 05 2010
EXTENSIONS
a(56) corrected by R. J. Mathar, Jun 07 2010
STATUS
approved