

A339216


Numbers k such that k and k+2 are both binary self numbers (A010061).


4



4, 13, 21, 30, 37, 46, 54, 78, 86, 95, 102, 111, 119, 128, 133, 142, 150, 159, 166, 175, 183, 207, 215, 224, 231, 240, 248, 270, 278, 287, 294, 303, 311, 335, 343, 352, 359, 368, 376, 385, 390, 399, 407, 416, 423, 432, 440, 464, 472, 481, 488, 497, 505, 526, 534
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OFFSET

1,1


COMMENTS

The least difference between consecutive binary self numbers is 2 (see Macris's proof at A010061).


LINKS



EXAMPLE

4 is a term since 4 and 6 = 4 + 2 are both binary self numbers.


MATHEMATICA

s[n_] := n + DigitCount[n, 2, 1]; m = 550; c = Complement[Range[m], Array[s, m]]; d = Differences[c]; ind = Position[d, 2] // Flatten; c[[ind]]


CROSSREFS



KEYWORD

nonn,base


AUTHOR



STATUS

approved



