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 A123710 #17 Jan 25 2021 15:26:22 %S A123710 4,6,8,9,16,25,27,32,49,64,81,121,125,128,169,243,256,289,343,361,512, %T A123710 529,625,729,841,961,1024 %N A123710 Indices n such that 4 = A123709(n) = number of nonzero terms in row n of triangle A123706. %C A123710 Triangle A123706 is the matrix inverse of triangle A010766, where A010766(n,k) = [n/k]. %C A123710 Except for a(2)=6, these are proper prime powers, i.e., numbers p^k where k>1, p prime (A025475). - _M. F. Hasler_, Feb 12 2012 %F A123710 a(n) = A025475(n) for n>2 (conjectured). - _M. F. Hasler_, Feb 12 2012 %o A123710 (PARI) for(n=1,1e4, A123709(n)==4 & print1(n",")) \\ _M. F. Hasler_, Feb 12 2012 %Y A123710 Cf. A123706, A123709, A123711, A123712; A010766. %K A123710 nonn,more %O A123710 1,1 %A A123710 _Paul D. Hanna_, Oct 09 2006