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A074939
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Even numbers such that base 3 representation contains no 2.
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6
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0, 4, 10, 12, 28, 30, 36, 40, 82, 84, 90, 94, 108, 112, 118, 120, 244, 246, 252, 256, 270, 274, 280, 282, 324, 328, 334, 336, 352, 354, 360, 364, 730, 732, 738, 742, 756, 760, 766, 768, 810, 814, 820, 822, 838, 840, 846, 850, 972, 976, 982, 984, 1000, 1002
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OFFSET
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0,2
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COMMENTS
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Even numbers in A005836; n such that binomial(2n,n) == 1 (mod 3).
Sum of an even number of distinct powers of 3. - Emeric Deutsch, Dec 03 2003
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LINKS
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FORMULA
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a(n) = A083094(n)/2; a(n) mod 3 = A010060(n); n such that coefficient of x^n equals 1 in Product_{k>=0} (1 - x^(3^k)).
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MATHEMATICA
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Select[2*Range[0, 600], DigitCount[#, 3, 2]==0&] (* Harvey P. Dale, Dec 10 2016 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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