OFFSET
1,1
COMMENTS
Equivalently, positions of zero digits in A167520 (when all terms are concatenated).
The first differences are (18, 18, 20, 18, 20, 18, 20, 18, 20, 1, 2, 3, 3, 3, 3, 3, 3, 3, 4, 30, 27, 30, 27, 30, 27, 30, 35, 1, 2, 3, 3, 3, 3, 3, 4, ...)
EXAMPLE
PROG
(PARI) base(n, b=10) = { my( a=[ n%b ]); while( 0<n\=b, a=concat( n%b, a )); a }
{a=b=[]; for(n=1, 499, #b>=n & for(i=a[n-1]+1, #b, b[i] & (a=concat(a, i)) & break); #a<n & a=concat(a, #b+1); b=concat(b, base(a[n]))); for(i=1, #b, b[i] || print1(i", "))}
CROSSREFS
KEYWORD
nonn,base
AUTHOR
M. F. Hasler, Nov 05 2009
STATUS
approved