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 A382631 #42 Apr 07 2025 16:05:13
%S A382631 85,149,165,169,170,277,293,297,298,325,329,330,337,338,340,533,549,
%T A382631 553,554,581,585,586,593,594,596,645,649,650,657,658,660,673,674,676,
%U A382631 680,1045,1061,1065,1066,1093,1097,1098,1105,1106,1108,1157,1161,1162,1169,1170
%N A382631 Integers whose binary representation contains exactly four 1's, no two 1's being adjacent.
%C A382631 Subsequence of A003714 and of A014312.
%e A382631 85 = 1010101_2, 1066 = 10000101010_2.
%o A382631 (Python)
%o A382631 def A382631_gen(): # generator of terms
%o A382631 n = 15
%o A382631 yield 85
%o A382631 while True: yield int(bin(n:=n^((a:=-n&n+1)|(a>>1)) if n&1 else ((n&~(b:=n+(a:=n&-n)))>>a.bit_length())^b)[2:].replace('1','01'),2)
%o A382631 A382631_list = list(islice(A382631_gen(),30))
%Y A382631 Cf. A003714, A014312, A136318, A173589.
%K A382631 nonn,easy,base
%O A382631 1,1
%A A382631 _Chai Wah Wu_, Apr 07 2025