

A169965


Numbers whose decimal expansion contains only 0's and 2's.


14



0, 2, 20, 22, 200, 202, 220, 222, 2000, 2002, 2020, 2022, 2200, 2202, 2220, 2222, 20000, 20002, 20020, 20022, 20200, 20202, 20220, 20222, 22000, 22002, 22020, 22022, 22200, 22202, 22220, 22222, 200000, 200002, 200020, 200022, 200200, 200202, 200220, 200222
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OFFSET

1,2


LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
Index entries for sequences related to carryless arithmetic


FORMULA

a(n+1) = Sum_{k>=0} A030308(n,k)*A093136(k+1).  Philippe Deléham, Oct 16 2011
a(n) = 2 * A007088(n1).


PROG

(PARI) print1(0); for(d=1, 5, for(n=2^(d1), 2^d1, print1(", "); forstep(i=d1, 0, 1, print1((n>>i)%2*2)))) \\ Charles R Greathouse IV, Nov 16 2011
(Haskell)
a169965 n = a169965_list !! (n1)
a169965_list = map (* 2) a007088_list
 Reinhard Zumkeller, Jan 10 2012


CROSSREFS

Cf. A007088, A014263, A169964, A169966, A169967.
Cf. A078241, A204093, A204094, A204095, A097256.
Sequence in context: A112405 A136885 A136909 * A202170 A136908 A196748
Adjacent sequences: A169962 A169963 A169964 * A169966 A169967 A169968


KEYWORD

nonn,base,easy


AUTHOR

N. J. A. Sloane, Aug 07 2010


STATUS

approved



