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 A035254 #11 Jun 07 2025 14:29:23 %S A035254 -3,-1,1,2,4,5,6,8,9,10,11,13,14,15,16,17,19,20,21,22,23,24,26,27,28, %T A035254 29,30,31,32,34,35,36,37,38,39,40,41,43,44,45,46,47,48,49,50,51,53,54, %U A035254 55,56,57,58,59,60,61,62,64 %N A035254 First differences of A035253. %F A035254 a(n) = A002024(n)+n-3. - _Chai Wah Wu_, Jun 07 2025 %o A035254 (Python) %o A035254 from math import isqrt %o A035254 def A035254(n): return n+(isqrt(n<<3)-5>>1) # _Chai Wah Wu_, Jun 07 2025 %Y A035254 Different from A030124. Cf. A002024, A014132, A014133. First differences are in A035214. %K A035254 sign,easy %O A035254 0,1 %A A035254 Robet Bronson (bob(AT)bronsons.com)