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 A288639 #17 Jun 23 2017 08:19:28
%S A288639 24,48,72,108,120,168,180,216,240,252,288,360,408,432,504,540,552,600,
%T A288639 612,648,720,756,768,792,828,864,900,912,960,1080,1128,1152,1188,1224,
%U A288639 1248,1260,1296,1368,1392,1440,1620,1656,1680,1692,1728,1800,1836,1848
%N A288639 Products of two distinct numbers that are the average of a pair of twin primes.
%e A288639 4 and 12 are two distinct numbers that are averages of twin prime pairs (i.e., 4 = (3+5)/2 and 12 = (11+13)/2), and 4*12 = 48, which is in the sequence.
%t A288639 m = 1 + Select[Range@1000, PrimeQ[#] && PrimeQ[# + 2] &]; Select[v Union@ Flatten@ Table[m[[i]] m[[j]], {i, Length[m]}, {j, i - 1}], # <= 4000 &] (* _Giovanni Resta_, Jun 13 2017 *)
%Y A288639 Cf. A014574, A249628.
%Y A288639 Subset of A286195.
%K A288639 nonn
%O A288639 1,1
%A A288639 _Wesley Ivan Hurt_, Jun 12 2017
%E A288639 More terms from _Giovanni Resta_, Jun 13 2017