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 A380140 #6 Jan 26 2025 09:08:23 %S A380140 12,19,26,30,33,40,41,47,52,54,56,61,63,68,71,74,75,82,85,86,89,90,96, %T A380140 101,103,107,109,110,116,117,118,124,128,129,131,132,138,140,145,146, %U A380140 147,151,152,155,159,161,162,166,173,176,178,180,182,184,185,187,191,194,195,201 %N A380140 Numbers of the form 4*j*k - j - k for j, k >= 2. %Y A380140 Cf. A054520, A380509. %K A380140 nonn %O A380140 1,1 %A A380140 _Hugo Pfoertner_, Jan 26 2025