A053335 a(n) contains n digits (either '3' or '6') and is divisible by 2^n.

6, 36, 336, 6336, 66336, 366336, 6366336, 36366336, 636366336, 3636366336, 33636366336, 333636366336, 3333636366336, 33333636366336, 633333636366336, 3633333636366336, 33633333636366336, 333633333636366336

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 3.

Crossrefs

Cf. A023407, A050621, A050622, A035014.

Sequence in context: A129584 A052559 A367490 * A222925 A370752 A108733

Adjacent sequences: A053332 A053333 A053334 * A053336 A053337 A053338

Keyword

base,nonn

Author

Henry Bottomley, Mar 06 2000

Status

approved