A161641 - OEIS

A161641

Positions n such that A010060(n) + A010060(n+4) = 1.

0, 1, 2, 3, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 24, 25, 26, 27, 32, 33, 34, 35, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 88, 89, 90, 91, 96, 97, 98, 99, 104, 105, 106, 107, 108

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OFFSET

1,3

COMMENTS

Also union of all numbers of the form A131323(n)-k, k=0, 1, 2, or 3.

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..10000

FORMULA

A001477 \ A161627.

MATHEMATICA

tm[0] = 0; tm[n_?EvenQ] := tm[n] = tm[n/2]; tm[n_] := tm[n] = 1 - tm[(n - 1)/2]; Reap[For[n = 0, n <= 16000, n++, If[tm[n] + tm[n + 4] == 1, Sow[n]]]][[2, 1]] (* G. C. Greubel, Jan 01 2018 *)

PROG

(PARI) is(n)=hammingweight(n)%2!=hammingweight(n+4)%2 \\ Charles R Greathouse IV, Aug 20 2013

CROSSREFS

Cf. A161639, A161627, A161579, A161580, A079523, A131323, A036554, A010060, A121539, A079523, A081706.

Sequence in context: A068800 A291838 A114585 * A053754 A353652 A080745

Adjacent sequences: A161638 A161639 A161640 * A161642 A161643 A161644

KEYWORD

nonn

AUTHOR

Vladimir Shevelev, Jun 15 2009

EXTENSIONS

More terms from R. J. Mathar, Aug 17 2009

STATUS

approved