OFFSET
0,2
LINKS
Max Alekseyev, Table of n, a(n) for n = 0..100
EXAMPLE
a(7)=85811686941=3*28603895647 since sigma(85811686941)= (2^2)*(2^5*19^7)=2^7*19^7 and 85811686941 is the smallest such number.
CROSSREFS
KEYWORD
nonn
AUTHOR
Walter Kehowski, Sep 06 2010
EXTENSIONS
Terms a(16) onward from Max Alekseyev, Mar 03 2014
STATUS
approved