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 A206802 #21 Sep 14 2016 17:32:06 %S A206802 1,3,9,13,23,29,43,67,76,106,128,140,166,208,253,269,320,356,375,435, %T A206802 477,543,635,683,708,760,787,843,1046,1106,1199,1231,1396,1430,1535, %U A206802 1643,1717,1831,1948,1988,2193,2235,2321,2365,2635,2911,3005 %N A206802 a(n) = (1/2)*A185382(n). %C A206802 See A185382. %t A206802 s[k_] := Prime[k + 1]; t[1] = 0; %t A206802 p[n_] := Sum[s[k], {k, 1, n}]; %t A206802 c[n_] := n*s[n] - p[n] %t A206802 t[n_] := t[n - 1] + (n - 1) s[n] - p[n - 1] %t A206802 Table[c[n], {n, 2, 100}] (* A185382 *) %t A206802 %/2 (* A206802 *) %t A206802 Flatten[Table[t[n], {n, 2, 40}]] (* A206803 *) %t A206802 %/2 (* A206804 *) %t A206802 Table[Sum[Prime[n + 1] - Prime[j + 1], {j, n - 1}]/2, {n, 2, 48}] (* _Michael De Vlieger_, Sep 13 2016 *) %Y A206802 Cf. A185382. %K A206802 nonn %O A206802 2,2 %A A206802 _Clark Kimberling_, Feb 13 2012