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 A065546 #11 Jun 18 2018 03:26:09
%S A065546 13,29,59,127,257,521,1049,2099,4201,8419,16843,33703,67409,134837,
%T A065546 269683,539389,1078787,2157587,4315183,8630387,17260781,34521589,
%U A065546 69043189,138086407,276172823,552345671,1104691373,2209382761
%N A065546 a(n) is smallest prime > 2*a(n-1), a(1) = 13.
%H A065546 Harry J. Smith, <a href="/A065546/b065546.txt">Table of n, a(n) for n = 1..200</a>
%t A065546 NextPrim[n_Integer] := Block[ {k = n + 1}, While[ !PrimeQ[k], k++ ]; Return[k]]; a[1] = 13; a[n_] := NextPrim[ 2*a[n - 1]]; Table[ a[n], {n, 1, 35} ]
%t A065546 NestList[NextPrime[2#]&,13,30] (* _Harvey P. Dale_, Feb 25 2015 *)
%o A065546 (PARI) { for (n=1, 200, if (n>1, a=nextprime(2*a), a=13); write("b065546.txt", n, " ", a) ) } \\ _Harry J. Smith_, Oct 21 2009
%K A065546 nonn
%O A065546 1,1
%A A065546 _Robert G. Wilson v_, Nov 28 2001