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A171781 Numbers for which the second bit of the binary expansion is equal to the last bit. 2
2, 3, 4, 7, 8, 10, 13, 15, 16, 18, 20, 22, 25, 27, 29, 31, 32, 34, 36, 38, 40, 42, 44, 46, 49, 51, 53, 55, 57, 59, 61, 63, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Note that A005843 INTERSECT A171781 = A171757. This is an example of two sequences which both have a limiting density, but whose intersection does not.

LINKS

Table of n, a(n) for n=1..63.

CROSSREFS

Cf. A005843, A171782, A171757, A171763.

Sequence in context: A089190 A220969 A207006 * A065294 A240073 A272919

Adjacent sequences:  A171778 A171779 A171780 * A171782 A171783 A171784

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Oct 12 2010

STATUS

approved

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Last modified April 23 07:51 EDT 2019. Contains 322381 sequences. (Running on oeis4.)