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 A193266 #16 Aug 04 2025 14:36:45
%S A193266 2,8,10,20,38,40,58,70,98,100,110,160,170,188,190,220,308,350,380,538,
%T A193266 568,598,628,640,680,688,698,740,748,818,850,968,1010,1028,1048,1088,
%U A193266 1190,1228,1300,1378,1420,1430,1448,1528,1540,1550,1568,1580,1730,1738
%N A193266 Numbers k such that k + 3 and k^2 + 9 are both prime.
%e A193266 2 is in the sequence since 2 + 3 = 5 and 2^2 + 9 = 13 are both prime;
%e A193266 8 is in the sequence since 8 + 3 = 11 and 8^2 + 9 = 73 are both prime.
%t A193266 Select[Prime[Range[3,300]]-3,PrimeQ[#^2+9]&] (* _Harvey P. Dale_, Nov 11 2014 *)
%o A193266 (PARI) {a=3;forstep(n=2,2000,2,if(isprime(n+a)&&isprime(n^2+a^2),print1(n",")))}
%Y A193266 Cf. A070689, A192794.
%K A193266 nonn
%O A193266 1,1
%A A193266 _Zak Seidov_, Dec 19 2012