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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A031461 Numbers whose base-4 representation has the same number of 0's as 3's. 1 1, 2, 5, 6, 9, 10, 12, 19, 21, 22, 25, 26, 28, 35, 37, 38, 41, 42, 44, 49, 50, 52, 56, 71, 75, 77, 78, 83, 85, 86, 89, 90, 92, 99, 101, 102, 105, 106, 108, 113, 114, 116, 120, 135, 139, 141, 142, 147, 149, 150, 153, 154, 156, 163, 165 (list; graph; refs; listen; history; text; internal format) OFFSET 1,2 COMMENTS Union of A031443 and A031448, i.e., numbers k in binary where the difference between numbers of 1's and 0's [A000120(k) - A023416(k) = -A037861(k)] is 1 or 0. - Henry Bottomley, Mar 02 2001 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 MATHEMATICA Select[Range[165], Equal @@ DigitCount[#, 4, {0, 3}] &] (* Amiram Eldar, Aug 03 2023 *) CROSSREFS Cf. A000120, A007090, A023416, A031443, A031448, A037861. Sequence in context: A286905 A028946 A213713 * A085183 A340289 A133759 Adjacent sequences: A031458 A031459 A031460 * A031462 A031463 A031464 KEYWORD nonn,base AUTHOR Clark Kimberling STATUS approved

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Last modified August 19 03:19 EDT 2024. Contains 375284 sequences. (Running on oeis4.)