A204093 Numbers whose set of base-10 digits is {0,6}.

0, 6, 60, 66, 600, 606, 660, 666, 6000, 6006, 6060, 6066, 6600, 6606, 6660, 6666, 60000, 60006, 60060, 60066, 60600, 60606, 60660, 60666, 66000, 66006, 66060, 66066, 66600, 66606, 66660, 66666, 600000, 600006, 600060, 600066, 600600, 600606, 600660, 600666

Offset: 0

Author

Reinhard Zumkeller, Jan 10 2012

Keywords

• nonn
• base

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

Crossrefs

Cf. A007088, A078245.

Cf. A169965, A169966, A169967, A169964, A204094, A204095, A097256.

Programs

Haskell

a204093 n = a204093_list !! n
a204093_list = map (* 6) a007088_list

Mathematica

Map[FromDigits,Tuples[{0,6},6]] (* Paolo Xausa, Oct 30 2023 *)

Python

def a(n): return int(bin(n)[2:].replace('1', '6'))
print([a(n) for n in range(40)]) # Michael S. Branicky, Jun 06 2021

Formula

a(n) = 6 * A007088(n).