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 A344342 Numbers k such that k and k + 1 are both Gray-code Niven numbers (A344341). 15
 1, 2, 3, 6, 7, 8, 14, 15, 27, 30, 31, 32, 39, 44, 51, 56, 62, 63, 75, 99, 104, 111, 123, 126, 127, 128, 135, 144, 155, 159, 174, 175, 184, 185, 195, 204, 207, 215, 224, 231, 234, 235, 243, 244, 248, 254, 255, 264, 275, 284, 294, 300, 304, 305, 315, 335, 354, 375 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 EXAMPLE 1 is a term since 1 and 2 are both Gray-code Niven numbers. MATHEMATICA gcNivenQ[n_] := Divisible[n, DigitCount[BitXor[n, Floor[n/2]], 2, 1]]; Select[Range[400], And @@ gcNivenQ[# + {0, 1}] &] CROSSREFS Cf. A005811, A014550. Subsequence of: A344341. Subsequences: A344343 and A344344. Similar sequences: A330927 (decimal), A328205 (factorial), A328209 (Zeckendorf), A328213 (lazy Fibonacci), A330931 (binary), A331086 (negaFibonacci), A333427 (primorial), A334309 (base phi), A331820 (negabinary), A342427 (base 3/2). Sequence in context: A189013 A242940 A127330 * A035346 A030164 A066646 Adjacent sequences: A344339 A344340 A344341 * A344343 A344344 A344345 KEYWORD nonn,base AUTHOR Amiram Eldar, May 15 2021 STATUS approved

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Last modified May 26 23:01 EDT 2024. Contains 372847 sequences. (Running on oeis4.)