OFFSET
1,1
COMMENTS
Since there exists no number < 10^233 with multiplicative persistence 12, a(n) = 99999999998777772 * 10^(n-17) + (10^(n-17)-1)/9 for 17 <= n < 233. - Sean A. Irvine, Apr 05 2021
LINKS
Sean A. Irvine, Java program (github)
N. J. A. Sloane, The persistence of a number, J. Recreational Math., 6 (1973), 97-98.
Eric Weisstein's World of Mathematics, Multiplicative Persistence.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
a(8)-a(18) from Donovan Johnson, Mar 30 2010
a(19)-a(20) from Sean A. Irvine, Apr 05 2021
STATUS
approved