A160233 Numbers k such that k is a member of A002183 but 2*k is not.

1280, 1600, 4800, 28672, 131072, 688128, 6881280, 7864320, 39321600, 43253760, 94371840, 201326592, 528482304, 9663676416, 115964116992, 241591910400, 265751101440, 347892350976, 811748818944, 3522410053632, 4174708211712, 21646635171840, 23811298689024, 27058293964800

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..1000

Example

1280 qualifies because 1280 is a member of A002183 but 1280*2 = 2560 is not.

Mathematica

(* capture the terms in the b002183.txt file: "Number of divisors of n-th highly composite number" and assign it to the variable 's' *) Select[ Take[s, 964], !MemberQ[s, 2 # ] &] (* Robert G. Wilson v, May 09 2009 *)

Crossrefs

Cf. A002182, A002183.

Sequence in context: A251889 A251886 A234137 * A251887 A251894 A251791

Adjacent sequences: A160230 A160231 A160232 * A160234 A160235 A160236

Keyword

nonn

Author

J. Lowell, May 04 2009

Extensions

More terms from Robert G. Wilson v, May 09 2009

More terms from Amiram Eldar, Nov 13 2019

Status

approved