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 A108840 #21 Feb 16 2025 08:32:58 %S A108840 4,22,109,1360,24404,17695283,6824557148 %N A108840 First step in Recamán's sequence A005132 at which there are n consecutive subtraction steps in a row. %H A108840 Eric Weisstein. <a href="https://mathworld.wolfram.com/RecamansSequence.html">Recamán's Sequence</a>. %e A108840 E.g., 109 is the third term of this sequence because it the first step in Recamán's sequence at which there are three consecutive subtraction steps in a row: %e A108840 109. 370 - 109 = 261 %e A108840 110. 261 - 110 = 151 %e A108840 111. 151 - 111 = 40 %Y A108840 Cf. A005132, A064288. %K A108840 nonn,more %O A108840 1,1 %A A108840 _Sergio Pimentel_, Jul 25 2005 %E A108840 a(6)-a(7) from _Jud McCranie_, Jan 24 2020