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 A128193 #21 May 19 2021 00:22:23 %S A128193 140,4572,1082,816,11885,13796,177,27187,31169,171594,98856,120624, %T A128193 872929,4973720,351333 %N A128193 First differences of values of n for Cullen primes in A005849. %C A128193 Carlos Rivera's Problem 50 is devoted to this topic. If we pair differences according to magnitude, we first obtain 177-140=37 a prime. This raises the question as to whether there are other such prime values. %H A128193 Carlos Rivera, <a href="https://www.primepuzzles.net/problems/prob_050.htm">Problem 50. Is there a Cullen prime Cn with n prime?</a>, The Prime Puzzles and Problems Connection. %F A128193 a(n) = A005849(n+1) - A005849(n). - _Michel Marcus_, Sep 27 2020 %e A128193 a(1)=140 because the first pair of n are 1 and 141. 141 - 1 = 140. %Y A128193 Cf. A005849, A128194. %K A128193 nonn,more %O A128193 1,1 %A A128193 _Enoch Haga_, Feb 18 2007 %E A128193 Offset 1 from _Michel Marcus_, Sep 27 2020 %E A128193 a(14)-a(15) added by _Florian Baur_, Sep 27 2020