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 A142863 #9 Mar 15 2023 11:11:43 %S A142863 4,6,9,10,14,21,22,25,26,34,38,39,46,49,55,57,58,62,74,82,86,93,94, %T A142863 106,111,118,121,122,129,134,142,146,155,158,166,169,178,183,194,201, %U A142863 202,203,205,206,214,218,219,226,237,253,254,262,274,278,289,291,298,301 %N A142863 Semiprimes n (A001358) for which A000001(n) is 2. %C A142863 Semiprimes p^2 or pq with p<q and gcd(p,q-1)=p. - _T. D. Noe_, Oct 08 2008 %H A142863 T. D. Noe, <a href="/A142863/b142863.txt">Table of n, a(n) for n=1..1000</a> %H A142863 John H. Conway, Heiko Dietrich and E. A. O'Brien, <a href="http://www.math.auckland.ac.nz/~obrien/research/gnu.pdf">Counting groups: gnus, moas and other exotica</a>. %Y A142863 Cf. A000001, A001358. %K A142863 nonn %O A142863 1,1 %A A142863 _N. J. A. Sloane_, Oct 03 2008 %E A142863 More terms from _R. J. Mathar_, Oct 04 2008