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A169884 Numbers consisting of either all even digits or just 5's and 0's. 6
0, 2, 4, 5, 6, 8, 20, 22, 24, 26, 28, 40, 42, 44, 46, 48, 50, 55, 60, 62, 64, 66, 68, 80, 82, 84, 86, 88, 200, 202, 204, 206, 208, 220, 222, 224, 226, 228, 240, 242, 244, 246, 248, 260, 262, 264, 266, 268, 280, 282, 284, 286, 288, 400, 402, 404, 406 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

These are all the divisors of zero in carryless arithmetic mod 10. E.g. 5 * 44 = 0.

LINKS

Table of n, a(n) for n=1..57.

David Applegate, Marc LeBrun and N. J. A. Sloane, Carryless Arithmetic (I): The Mod 10 Version.

Index entries for 10-automatic sequences.

Index entries for sequences related to carryless arithmetic

MATHEMATICA

With[{upto=410}, Select[Union[Join[Select[Range[upto], And@@EvenQ[ IntegerDigits[#]]&], FromDigits/@Tuples[{5, 0}, Ceiling[Log[ 10, upto]]]]], #<=upto&]] (* Harvey P. Dale, Aug 05 2011 *)

CROSSREFS

Cf. A004520, A059729, A168294, A168541, A169885, A169886, A169887.

Sequence in context: A326703 A244008 A104704 * A341260 A072726 A153242

Adjacent sequences:  A169881 A169882 A169883 * A169885 A169886 A169887

KEYWORD

nonn,base,easy

AUTHOR

David Applegate, Marc LeBrun and N. J. A. Sloane, Jul 06 2010

STATUS

approved

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Last modified February 27 11:21 EST 2021. Contains 341655 sequences. (Running on oeis4.)