A045926 All digits even and nonzero.

2, 4, 6, 8, 22, 24, 26, 28, 42, 44, 46, 48, 62, 64, 66, 68, 82, 84, 86, 88, 222, 224, 226, 228, 242, 244, 246, 248, 262, 264, 266, 268, 282, 284, 286, 288, 422, 424, 426, 428, 442, 444, 446, 448, 462, 464, 466, 468, 482, 484, 486, 488, 622, 624, 626, 628, 642

Offset

1,1

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Index entries for 10-automatic sequences.

Formula

a(n) = 2 * A084544(n). - Reinhard Zumkeller, Jan 01 2013

Prog

(Haskell)
a045926 n = a045926_list !! (n-1)
a045926_list = filter (all (`elem` "2468") . show) [2, 4..]
-- Reinhard Zumkeller, Jan 01 2013
(Python)
def A045926(n):
    m = (3*n+1).bit_length()-1>>1
    return int(''.join((str(((3*n+1-(1<<(m<<1)))//(3<<((m-1-j)<<1))&3)+1) for j in range(m))))<<1 # Chai Wah Wu, Feb 08 2023

Crossrefs

Cf. A045927, A014261, A014263, A192370.

Sequence in context: A265342 A335661 A230105 * A045927 A165931 A321600

Adjacent sequences: A045923 A045924 A045925 * A045927 A045928 A045929

Keyword

nonn,easy,base

Author

Felice Russo

Extensions

More terms from Patrick De Geest, Jun 15 1999

Status

approved