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 A179664 #21 Mar 16 2024 11:19:13 %S A179664 384,640,896,1408,1664,2176,2432,2944,3712,3968,4374,4736,5248,5504, %T A179664 6016,6784,7552,7808,8576,9088,9344,10112,10624,10935,11392,12416, %U A179664 12928,13184,13696,13952,14464,15309,16256,16768,17536,17792,19072,19328 %N A179664 Products of the 7th power of a prime and a distinct prime (p^7*q). %H A179664 T. D. Noe, <a href="/A179664/b179664.txt">Table of n, a(n) for n = 1..1000</a> %H A179664 Will Nicholes, <a href="http://willnicholes.com/math/primesiglist.htm">Prime Signatures</a> %H A179664 <a href="/index/Pri#prime_signature">Index to sequences related to prime signature</a> %t A179664 f[n_]:=Sort[Last/@FactorInteger[n]]=={1,7};Select[Table[n,{n,8!}],f[ # ]&] %o A179664 (PARI) list(lim)=my(v=List(),t);forprime(p=2,(lim\2)^(1/7),t=p^7;forprime(q=2,lim\t,if(p==q,next);listput(v,t*q)));vecsort(Vec(v)) \\ _Charles R Greathouse IV_, Jul 20 2011 %K A179664 nonn %O A179664 1,1 %A A179664 _Vladimir Joseph Stephan Orlovsky_, Jul 23 2010