OFFSET
1,1
COMMENTS
This is the smallest number of persistence 11 (cf. A003001). It is conjectured that no number has persistence greater than 11.
LINKS
N. J. A. Sloane, The persistence of a number, J. Recreational Math., 6 (1973), 97-98.
FORMULA
a(n)=A121110(n-1), n>=3. [From R. J. Mathar, Aug 07 2008]
MATHEMATICA
NestWhileList[Times@@IntegerDigits[#]&, 277777788888899, #>0&] (* Harvey P. Dale, Nov 25 2022 *)
CROSSREFS
KEYWORD
nonn,fini,full,base
AUTHOR
N. J. A. Sloane, Aug 12 2006
EXTENSIONS
Edited by Charles R Greathouse IV, Aug 05 2010
STATUS
approved