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 A230481 #13 Nov 04 2024 01:32:38 %S A230481 -2,4,12,24,30,56,52,78,84,82,108,88,126,144,126,162,150,204,210,210, %T A230481 248,242,234,348,266,268,320,362,380,394,304,396,340,480,378,420,466, %U A230481 486,476,464,498,578,476,566,592,678,600,456,524,660,714,742,768,756 %N A230481 a(n) = prime(prime(2*n)) - prime(2*prime(n)). %C A230481 As difference of two odd primes, all terms are even. %H A230481 M. F. Hasler, <a href="/A230481/b230481.txt">Table of n, a(n) for n = 1..10000</a> %F A230481 a(n) = A217622(n) - A230460(n) = 2*A230482(n). %o A230481 (PARI) a=n->prime(prime(2*n))-prime(2*prime(n)) %Y A230481 Cf. A066066, A000040, A006450, A031215, A217622, A230460. %K A230481 sign %O A230481 1,1 %A A230481 _M. F. Hasler_, Oct 20 2013