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 A084198 #15 Dec 27 2014 03:37:56
%S A084198 5,7,19,43,67,97,163,181,211,283,331,349,523,547,601,691,787,853,907,
%T A084198 937,1021,1051,1123,1171,1429,1531,1549,1723,1777,1867,2011,2029,2053,
%U A084198 2083,2113,2251,2281,2347,2371,2467,2521,2707,2731,2749,2803,2971,3067
%N A084198 Primes p such that there exists exactly one prime q<p with q+1 dividing p+1.
%C A084198 A084196(A049084(a(n)))=1.
%H A084198 Reinhard Zumkeller, <a href="/A084198/b084198.txt">Table of n, a(n) for n = 1..1000</a>
%t A084198 pdQ[n_]:=Module[{prs=Prime[Range[500]],p1},p1=Select[prs,#<n&]+1;Count[ p1,_?(Divisible[n+1,#]&)]==1]; Select[Prime[Range[500]],pdQ] (* _Harvey P. Dale_, Dec 24 2013 *)
%o A084198 (Haskell)
%o A084198 a084198 n = a084198_list !! (n-1)
%o A084198 a084198_list = map a000040 $ filter ((== 1) . a084196) [1..]
%o A084198 -- _Reinhard Zumkeller_, Jan 06 2014
%K A084198 nonn
%O A084198 1,1
%A A084198 _Reinhard Zumkeller_, May 18 2003
%E A084198 Corrected by _T. D. Noe_, Oct 25 2006