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 A234037 #38 Aug 31 2020 02:40:13 %S A234037 5,9,10,13,17,18,20,21,23,26,29,33,34,36,37,39,40,42,43,46,47,51,52, %T A234037 58,61,65,66,68,69,71,72,73,74,75,77,78,80,81,84,85,86,89,92,93,94,95, %U A234037 101,102,104,107,109,113,115,116,122,125,129,130,132,133,135,136,137 %N A234037 The union of odious numbers with evil squares and evil numbers with odious squares. %C A234037 Numbers n with odd sum of binary weight of n and binary weight of n^2. %C A234037 Primes are in this sequence: 5, 13, 17, 23, 29, 37, 43, 47, 61, 71, 73,.... %C A234037 Evil numbers with odious squares: 5, 9, 10, 17, 18, 20, 23, 29, 33, 34,... %C A234037 Odious numbers with evil squares: 13, 21, 26, 37, 42, 47, 52, 61, 69,... %H A234037 Amiram Eldar, <a href="/A234037/b234037.txt">Table of n, a(n) for n = 1..10000</a> %e A234037 a(3) = 10 because 2 (binary weight of 10) + 3 (binary weight of 100) = 5 (odd). %e A234037 a(4) = 13 because 3 (binary weight of 13) + 4 (binary weight of 169) = 7 (odd). %t A234037 Select[Range[100], Mod[DigitCount[#, 2, 1], 2] != Mod[DigitCount[#^2, 2, 1], 2] &] (* _Amiram Eldar_, Aug 31 2020 *) %Y A234037 Cf. A000069, A000120, A001969, A159918, A231431, A235001. %K A234037 nonn,base %O A234037 1,1 %A A234037 _Gerasimov Sergey_, Jan 13 2014 %E A234037 Wrong term removed by _Amiram Eldar_, Aug 31 2020