OFFSET
1,1
COMMENTS
If n is in the sequence, k*n is in the sequence for all k > 1. So sequence is union of arithmetic progressions such as numbers of the form 12*k, 40*k, 45*k, ... - Altug Alkan, Nov 30 2015
Numbers appearing more than once in A009012. - Sean A. Irvine, Apr 20 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved