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 A057470 #18 Jul 02 2025 16:02:00 %S A057470 5,11,31,59,109,179,277,353,547,587,773,859,1063,1153,1201,1433,1499, %T A057470 1723,1823,2063,2341,2897,3001,3259,3733,4133,4397,4549,4759,4933, %U A057470 6217,6311,6353,6653,6841,8101,8221,8377,8513,8747,9293,9973,10433,10559 %N A057470 Let prime(i) = i-th prime, let twin(n) = (P,Q) be n-th pair of twin primes; sequence gives prime(P). %H A057470 Amiram Eldar, <a href="/A057470/b057470.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..1000 from Harvey P. Dale) %F A057470 From _Amiram Eldar_, Feb 14 2025: (Start) %F A057470 a(n) = prime(A001359(n)). %F A057470 a(n) = A151799(A151799(A057473(n))). (End) %e A057470 The 3rd pair of twin primes is twin(3) = (11,13), so a(3) = prime(11) = 31. %t A057470 Prime/@Select[Partition[Prime[Range[300]],2,1],#[[2]]-#[[1]]==2&][[;;,1]] (* _Harvey P. Dale_, May 21 2023 *) %Y A057470 Cf. A001359, A057473, A151799. %K A057470 nonn %O A057470 1,1 %A A057470 _Cino Hilliard_, Sep 10 2000 %E A057470 More terms from _James Sellers_, Sep 11 2000