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

Author

N. J. A. Sloane, Sep 03 2014

Keywords

• nonn
• base

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

Crossrefs

Complement of A241816.

Cf. A091067.

Programs

Mathematica

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

PARI

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

Formula

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

Extensions

More terms from Alois P. Heinz, Sep 07 2014

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