OFFSET
1,1
LINKS
M. Fleuren, Factors and primes of Smarandache sequences.
M. Fleuren, Smarandache Factors and Reverse factors
Carlos Rivera, Puzzle 8. Primes by Listing, The Prime Puzzles & Problems Connection.
EXAMPLE
a(2)=9 because 987654321 = 3^2 * 17^2 * 379721.
CROSSREFS
KEYWORD
nonn,base,hard
AUTHOR
Patrick De Geest, Aug 15 1999
EXTENSIONS
Definition corrected by Charles R Greathouse IV, Sep 20 2012
a(17)-a(24) and name corrected by Sean A. Irvine, Aug 17 2021
a(25)-a(27) from Daniel Suteu, Aug 18 2021
STATUS
approved