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 A084759 #13 Sep 03 2021 01:55:23 %S A084759 4,6,9,10,14,20,25,32,40,49,60,70,82,95,110,124,140,158,175,194,214, %T A084759 235,258,280,304,329,355,382,410,440,469,500,532,565,600,634,670,707, %U A084759 745,784,824,865,908,950,994,1040,1085,1132,1180,1230,1281,1330,1382,1435 %N A084759 Composite numbers in ascending order such that the difference of successive terms is unique. a(m) - a(m-1) = a(k) - a(k-1) iff m = k. %C A084759 The sequence of first differences is 2, 3, 1, 4, 6, 5, 7, 8, 9, 11, 10, 12, 13, 15, 14, 16, 18, 17, 19, 20, 21, 23, 22, 24, 25, 26, 27, 28, ... Conjecture: every number is a term of this sequence. For every number r there exists some k such that a(k) - a(k-1) = r. %e A084759 The term after 14 is 20 and not 18 or 16 as 6-4 = 16-14 = 2, 18-14 = 14-10 = 4. %Y A084759 Cf. A002808, A084758. %K A084759 nonn %O A084759 1,1 %A A084759 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 17 2003 %E A084759 More terms from _David Wasserman_, Jan 05 2005