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 A039605 Numbers whose base-12 representation has the same nonzero number of 1's and 3's. 1
 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)
 OFFSET 1,1 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE 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 MATHEMATICA Select[Range[1100], DigitCount[#, 12, 1]==DigitCount[#, 12, 3]>0&] (* Harvey P. Dale, Apr 21 2011 *) CROSSREFS Sequence in context: A147221 A051461 A321383 * A032654 A320721 A086096 Adjacent sequences: A039602 A039603 A039604 * A039606 A039607 A039608 KEYWORD nonn,base,easy AUTHOR STATUS approved

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Last modified January 29 07:45 EST 2023. Contains 359915 sequences. (Running on oeis4.)