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 A142198 #9 Sep 08 2022 08:45:35
%S A142198 79,199,239,359,439,479,599,719,839,919,1039,1279,1319,1399,1439,1559,
%T A142198 1759,1879,1999,2039,2239,2399,2719,2879,2999,3079,3119,3319,3359,
%U A142198 3559,3719,3919,4079,4159,4519,4639,4679,4759,4799,4919,4999,5039,5119,5279,5399
%N A142198 Primes congruent to 39 mod 40.
%H A142198 Vincenzo Librandi, <a href="/A142198/b142198.txt">Table of n, a(n) for n = 1..1000</a>
%F A142198 a(n) ~ 16n log n. - _Charles R Greathouse IV_, Jul 02 2016
%t A142198 Select[Prime[Range[2000]],MemberQ[{39},Mod[#,40]]&] (* _Vincenzo Librandi_, Aug 22 2012 *)
%o A142198 (Magma) [p: p in PrimesUpTo(7000) | p mod 40 eq 39 ]; // _Vincenzo Librandi_, Aug 22 2012
%o A142198 (PARI) is(n)=isprime(n) && n%40==39 \\ _Charles R Greathouse IV_, Jul 02 2016
%Y A142198 Cf. A000040.
%K A142198 nonn,easy
%O A142198 1,1
%A A142198 _N. J. A. Sloane_, Jul 11 2008