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 A124413 #11 Mar 25 2020 06:50:21
%S A124413 765,3420,7695,8325,16650,22185,28995,33300,41715,52935,72510,75075,
%T A124413 82950,99810,104715,106425,115620,121275,145635,159840,165900,173070,
%U A124413 188745,190815,192795,222870,225705,239400,240510,253395,253890,256410
%N A124413 Numbers k such that 2*k+1, 4*k+1, 8*k+1, 16*k+1 and 32*k+1 are primes.
%H A124413 Amiram Eldar, <a href="/A124413/b124413.txt">Table of n, a(n) for n = 1..10000</a>
%t A124413 Select[15*Range[20000], And @@ PrimeQ /@ ({2, 4, 8, 16, 32}*# + 1) &] (* _Ray Chandler_, Nov 21 2006 *)
%Y A124413 Cf. A005097, A123998, A124041, A124412-A124417.
%K A124413 nonn
%O A124413 1,1
%A A124413 _Artur Jasinski_, Nov 02 2006