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 A112559 #17 Sep 08 2022 08:45:22 %S A112559 3,9,18,24,48,69,93,102,108,144,168,177,213,249,258,273,282,324,357, %T A112559 363,387,399,438,444,504,507,573,609,669,678,738,759,762,777,807,864, %U A112559 867,909,942,948,963,1014,1068,1074,1182,1197,1248,1299,1389,1392,1413,1488 %N A112559 Numbers k such that both k and 4k + 1 are in A005098. %C A112559 All terms are multiples of 3. %C A112559 Numbers k such that 4*k+1 and 16*k+5 are both prime. - _Vincenzo Librandi_, Dec 13 2010 %C A112559 These k cannot have least significant digits 0, 1, 5, or 6. - _J. M. Bergot_, Jul 06 2011 %H A112559 R. J. Mathar, <a href="/A112559/b112559.txt">Table of n, a(n) for n = 1..1738</a> %F A112559 a(n) = 3 * A179652(n). - _Joerg Arndt_, Jul 10 2011 %o A112559 (Magma) [n: n in [0..3000] | IsPrime(4*n+1)and IsPrime(16*n+5)] // _Vincenzo Librandi_, Dec 13 2010 %Y A112559 Cf. A002144, A175600. %K A112559 nonn %O A112559 1,1 %A A112559 _Zak Seidov_, May 26 2007