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 A070213 #20 Apr 16 2025 12:26:47 %S A070213 4,8,18,20,70 %N A070213 Numbers k such that A056542(k) is prime. %C A070213 The 6th term (if it exists) is larger than 1019. %C A070213 No additional primes for n < 14000. - _T. D. Noe_, Jul 07 2005 %C A070213 a(6) > 25000. - _Michael S. Branicky_, Apr 16 2025 %H A070213 Tom Mueller, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL8/Mueller/mueller6.html">Prime and Composite Terms in Sloane's Sequence A056542</a>, Journal of Integer Sequences, Vol. 8 (2005), Article 05.3.3. %Y A070213 Cf. A056542. %K A070213 nonn,hard,more %O A070213 1,1 %A A070213 Tom Mueller (muel4503(AT)uni-trier.de), May 07 2002 %E A070213 a(5) from Tom Mueller (muel4503(AT)uni-trier.de), Oct 30 2004 %E A070213 Name clarified by _Sean A. Irvine_, Jun 02 2024