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A039231
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Numbers whose base-12 representation has the same number of 2's and 4's.
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0
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0, 1, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 17, 18, 19, 20, 21, 22, 23, 28, 36, 37, 39, 41, 42, 43, 44, 45, 46, 47, 50, 60, 61, 63, 65, 66, 67, 68, 69, 70, 71, 72, 73, 75, 77, 78, 79, 80, 81, 82, 83, 84, 85, 87, 89, 90, 91, 92, 93, 94, 95, 96, 97, 99, 101, 102, 103, 104
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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LINKS
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Table of n, a(n) for n=1..69.
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MATHEMATICA
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Select[Range[0, 150], DigitCount[#, 12, 2]==DigitCount[#, 12, 4]&] (* Harvey P. Dale, Mar 06 2022 *)
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PROG
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(PARI) f(n, b, d) = #select(x->x==d, digits(n, b));
select(n->f(n, 12, 2)==f(n, 12, 4), [0..230]) \\ Petros Hadjicostas, Jul 09 2020
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CROSSREFS
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Sequence in context: A138884 A008521 A299489 * A194387 A039175 A048293
Adjacent sequences: A039228 A039229 A039230 * A039232 A039233 A039234
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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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