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 A173619 #8 Jul 10 2024 15:54:23 %S A173619 220,84,460,282,342,176,142,418,236,120,456,756,336,2,310,780,1140, %T A173619 1356,364,160,430,1350,324,720,1496,940,6,234,510,1218,132,864,2000, %U A173619 16,1230,3050,376,2384,3580,780 %N A173619 Differences between consecutive pseudoprimes to base 2. %C A173619 These are the differences between the numbers in sequence A001567. %H A173619 Karl K. Hovekamp, <a href="/A173619/b173619.txt">Table of n, a(n) for n = 1..101628</a> %e A173619 341, 561, 645, 1105, .... (sequence A001567) %e A173619 abs(341-561)=220 %e A173619 abs(561-645)=84 %e A173619 abs(645-1105)=460 %e A173619 .... %Y A173619 Cf. A001567. %K A173619 nonn %O A173619 1,1 %A A173619 _Karl Hovekamp_, Feb 22 2010