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 A147797 #5 Jul 14 2012 11:32:21 %S A147797 3,41,1607,32441,557729,8265137,115438691,1523976761,19358094101, %T A147797 239211161009,2891512532927,34338035342339,401888325140039, %U A147797 4646528385435887 %N A147797 The 10^n-th twin prime, A001097(10^n). %C A147797 Since A001097(2)=5 is the only number to be member of two twin prime pairs, all terms of this sequence are lower twin primes A001359(k), k = 1,6,51,501,5001,..., cf. the given formula. %F A147797 a(n) = A001359([10^n/2]+1) %Y A147797 Cf. A146214. %K A147797 more,nonn %O A147797 0,1 %A A147797 _M. F. Hasler_, Dec 06 2008 %E A147797 a(6)-a(13) from _Donovan Johnson_, Dec 18 2009