OFFSET
1,1
COMMENTS
a(20) >= 150. - Max Alekseyev, Aug 26 2021
LINKS
Hisanori Mishima, Factorizations of many number sequences
Hisanori Mishima, Factorizations of many number sequences
EXAMPLE
a(1) = 9 so A005165(9) = 326981 = 79 * 4139 is a semiprime.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Eric Chen, Dec 24 2014
EXTENSIONS
a(18)-a(19) from Max Alekseyev, Aug 26 2021
STATUS
approved