OFFSET
1,1
LINKS
Ray Chandler, Table of n, a(n) for n = 1..1000
FORMULA
a(n)=a(n-1)+10^(n-1)*(6+3*[a(n-1)/2^(n-1) mod 2]) i.e. a(n) ends with a(n-1); if (n-1)-th term is divisible by 2^n then n-th term begins with a 6, if not then n-th term begins with a 9.
MATHEMATICA
Table[Select[FromDigits/@Tuples[{6, 9}, n], Mod[#, 2^n]==0&], {n, 20}]//Flatten (* Harvey P. Dale, Sep 15 2023 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Henry Bottomley, Mar 06 2000
STATUS
approved