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A261415
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The maximal midpoint-free set Z_7^{+}{0,1,3}.
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0
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0, 1, 3, 7, 8, 10, 21, 22, 24, 49, 50, 52, 56, 57, 59, 70, 71, 73, 147, 148, 150, 154, 155, 157, 168, 169, 171, 343, 344, 346, 350, 351, 353, 364, 365, 367, 392, 393, 395, 399, 400, 402, 413, 414, 416, 490, 491, 493, 497, 498, 500, 511, 512, 514
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OFFSET
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1,3
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COMMENTS
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The sequence consists of the numbers that expressed in base 7 contain only the digits 0, 1 and 3. - Giovanni Resta, Aug 26 2015
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LINKS
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MATHEMATICA
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Select[Range[0, 1000], Union[ IntegerDigits[#, 7], {0, 1, 3}] == {0, 1, 3} &] (* Giovanni Resta, Aug 26 2015 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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