This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A065878 #21 Aug 05 2025 03:38:23 %S A065878 3,5,7,9,11,13,14,15,17,19,22,23,25,26,27,28,29,30,31,33,35,37,38,39, %T A065878 41,43,44,45,46,47,49,50,51,52,53,54,56,57,58,59,61,62,63,65,67,70,71, %U A065878 73,74,75,76,77,78,79,82,83,85,86,87,88,89,90,91,93,94,95,97,98,99,100 %N A065878 Numbers which are not an integer multiple of their number of binary 1's. %H A065878 Amiram Eldar, <a href="/A065878/b065878.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..1000 from Harry J. Smith) %e A065878 5 is in the sequence since 5 = 101_2 and 5 is not a multiple of 1 + 0 + 1 = 2. %t A065878 Select[Range[100],!IntegerQ[#/Total[IntegerDigits[#,2]]]&] (* _Harvey P. Dale_, Apr 20 2011 *) %o A065878 (PARI) isok(k) = k % hammingweight(k); \\ _Amiram Eldar_, Aug 04 2025 %Y A065878 Complement of A049445. %Y A065878 The base-10 equivalent is A065877. %Y A065878 Cf. A000120, A058898, A065413, A065879, A065880. %K A065878 base,nonn,easy %O A065878 1,1 %A A065878 _Henry Bottomley_, Nov 26 2001