OFFSET
1,2
COMMENTS
Not counting zero as a one-digit number.
REFERENCES
William Mayne, sci.math, Jun 15 1991
FORMULA
a(n) = # { i : 10^(n-1) < i < 10^n and A051802(i)=1 }.
CROSSREFS
KEYWORD
nonn,base,hard
AUTHOR
Dan Hoey, Dec 09 1999
STATUS
approved