A246590 Even numbers whose odd part is of the form 4m+3; Numbers missing from A241816.

6, 12, 14, 22, 24, 28, 30, 38, 44, 46, 48, 54, 56, 60, 62, 70, 76, 78, 86, 88, 92, 94, 96, 102, 108, 110, 112, 118, 120, 124, 126, 134, 140, 142, 150, 152, 156, 158, 166, 172, 174, 176, 182, 184, 188, 190, 192, 198, 204, 206, 214, 216, 220, 222, 224, 230, 236

Offset

1,1

Comments

Numbers with bit-0 in their binary representation zero, and whose least significant 1-bit is neighbored (to the left) by another 1-bit, in other words, all even terms of A091067. - Antti Karttunen, Feb 20 2015

The asymptotic density of this sequence is 1/4. - Amiram Eldar, Aug 31 2024

Links

Alois P. Heinz, Table of n, a(n) for n = 1..10000

Formula

a(n) = 2*A091067(n). - Antti Karttunen, Feb 20 2015

Mathematica

Select[2 * Range[120], Mod[# / 2^IntegerExponent[#, 2], 4] == 3 &] (* Amiram Eldar, Aug 31 2024 *)

Prog

(PARI) is(k) = !(k % 2) && (k >> valuation(k, 2)) % 4 == 3; \\ Amiram Eldar, Aug 31 2024

Crossrefs

Complement of A241816.

Cf. A091067.

Sequence in context: A315611 A315612 A315613 * A214399 A079946 A315614

Adjacent sequences: A246587 A246588 A246589 * A246591 A246592 A246593

Keyword

nonn,base

Author

N. J. A. Sloane, Sep 03 2014

Extensions

More terms from Alois P. Heinz, Sep 07 2014

New definition added to name by Antti Karttunen, Feb 20 2015

Status

approved