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 A245174 #18 Oct 09 2018 05:41:22
%S A245174 4,0,8,-4,8,-10,8,10,-8,12,-8,-10,8,10,6,-30,42,-26,-8,20,-4,0,18,-10,
%T A245174 -22,8,-12,6,74,-62,4,-10,38,-44,24,6,-24,16,-8,-8,42,-48,12,-14,64,
%U A245174 32,-88,-10,10
%N A245174 Second differences of A006450.
%H A245174 Jens Kruse Andersen, <a href="/A245174/b245174.txt">Table of n, a(n) for n = 1..10000</a>
%H A245174 R. G. Batchko, <a href="http://arxiv.org/abs/1405.2900">A prime fractal and global quasi-self-similar structure in the distribution of prime-indexed primes</a>, arXiv preprint arXiv:1405.2900, 2014. See Table 2.
%t A245174 Differences[Table[Prime[Prime[n]], {n, 1, 100}], 2] (* _Jean-François Alcover_, Oct 09 2018 *)
%o A245174 (PARI) f(n) = prime(prime(n))
%o A245174 a(n) = f(n+2)-2*f(n+1)+f(n)
%o A245174 vector(50, n, a(n)) \\ _Jens Kruse Andersen_, Jul 18 2014
%Y A245174 Cf. A006450.
%K A245174 sign
%O A245174 1,1
%A A245174 _N. J. A. Sloane_, Jul 17 2014