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 A124491 #10 Oct 11 2019 11:06:48
%S A124491 1447110,30020760,32261985,121012185,203937090,546020475,546037695,
%T A124491 837344865,1140530160,2517567255,2664703335,2841691440,2896212165,
%U A124491 3000108405,3190108740,5204790360,5744351970,6872932605,7090912185
%N A124491 Numbers n such that 2n-1, 4n-1, 6n-1, 8n-1, 10n-1, 12n-1, 14n-1 and 16n-1 are primes.
%C A124491 All terms are multiples of 105. - _Harvey P. Dale_, May 08 2019
%t A124491 k = 0;inc = 3*5*7;While[k < 7200000000,k += inc;While[Nand @@ PrimeQ /@ ({2, 4, 6, 8, 10, 12, 14, 16}*k - 1), k += inc];Print[k];];(* _Ray Chandler_, Nov 21 2006 *)
%t A124491 Select[Range[105,7091*10^6,105],AllTrue[2*Range[8]#-1,PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* _Harvey P. Dale_, May 08 2019 *)
%Y A124491 Cf. A124485-A124492.
%K A124491 nonn
%O A124491 1,1
%A A124491 _Artur Jasinski_, Nov 04 2006
%E A124491 Corrected and extended by _Ray Chandler_, Nov 21 2006