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 A319422 Records in A175046. 4
 3, 12, 24, 51, 99, 204, 396, 408, 819, 1587, 1635, 3276, 6348, 6540, 6552, 13107, 25395, 26163, 26211, 52428, 101580, 104652, 104844, 104856, 209715, 406323, 418611, 419379, 419427, 838860, 1625292, 1674444, 1677516, 1677708, 1677720, 3355443, 6501171 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(n) in binary is either an alternating string of 11's and 00's, or exactly one of the 00's is replaced by 000 (see A319423). - Chai Wah Wu, Oct 04 2018 LINKS Chai Wah Wu, Table of n, a(n) for n = 1..10099 Chai Wah Wu, Record values in appending and prepending bitstrings to runs of binary digits, arXiv:1810.02293 [math.NT], 2018 MATHEMATICA b[n_] := (Append[#, #[[1]]]& /@ Split[IntegerDigits[n, 2]]) // Flatten // FromDigits[#, 2]&; Reap[For[rec = 0; k = 1, k < 3000, k++, bk = b[k]; If[bk > rec, rec = bk; Sow[rec]]]][[2, 1]] (* Jean-François Alcover, Nov 12 2018 *) CROSSREFS Cf. A175046, A319423, A319424 (written in binary). Sequence in context: A297675 A112236 A050180 * A272173 A028725 A047166 Adjacent sequences: A319419 A319420 A319421 * A319423 A319424 A319425 KEYWORD nonn AUTHOR N. J. A. Sloane, Sep 23 2018 STATUS approved

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Last modified June 17 07:23 EDT 2024. Contains 373433 sequences. (Running on oeis4.)