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A039605
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Numbers whose base-12 representation has the same nonzero number of 1's and 3's.
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1
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15, 37, 147, 171, 180, 182, 184, 185, 186, 187, 188, 189, 190, 191, 195, 207, 219, 231, 243, 255, 267, 279, 303, 325, 433, 444, 446, 448, 449, 450, 451, 452, 453, 454, 455, 457, 481, 493, 505, 517, 529, 541, 553, 565, 591, 613, 735, 757, 879, 901, 1023
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Robert Israel, Table of n, a(n) for n = 1..10000
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MAPLE
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filter:= proc(n) local L, v;
L:= convert(n, base, 12);
v:= numboccur(1, L);
v > 0 and v = numboccur(3, L)
end proc:
select(filter, [$1..2000]); # Robert Israel, Dec 31 2019
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MATHEMATICA
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Select[Range[1100], DigitCount[#, 12, 1]==DigitCount[#, 12, 3]>0&] (* Harvey P. Dale, Apr 21 2011 *)
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CROSSREFS
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Sequence in context: A147221 A051461 A321383 * A032654 A320721 A086096
Adjacent sequences: A039602 A039603 A039604 * A039606 A039607 A039608
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KEYWORD
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nonn,base,easy
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AUTHOR
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Olivier Gérard
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STATUS
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approved
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