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 A025623 #17 Jul 06 2025 10:02:44
%S A025623 1,5,8,25,40,64,125,200,320,512,625,1000,1600,2560,3125,4096,5000,
%T A025623 8000,12800,15625,20480,25000,32768,40000,64000,78125,102400,125000,
%U A025623 163840,200000,262144,320000,390625,512000,625000,819200,1000000,1310720
%N A025623 Numbers of form 5^i*8^j, with i, j >= 0.
%H A025623 Amiram Eldar, <a href="/A025623/b025623.txt">Table of n, a(n) for n = 1..10000</a>
%F A025623 Sum_{n>=1} 1/a(n) = (5*8)/((5-1)*(8-1)) = 10/7. - _Amiram Eldar_, Sep 25 2020
%F A025623 a(n) ~ exp(sqrt(2*log(5)*log(8)*n)) / sqrt(40). - _Vaclav Kotesovec_, Sep 25 2020
%F A025623 a(n) = 5^A025653(n) * 8^A025673(n). - _R. J. Mathar_, Jul 06 2025
%t A025623 n = 10^6; Flatten[Table[5^i*8^j, {i, 0, Log[5, n]}, {j, 0, Log[8, n/5^i]}]] // Sort (* _Amiram Eldar_, Sep 25 2020 *)
%Y A025623 Subsequence of A003592.
%K A025623 easy,nonn
%O A025623 1,2
%A A025623 _David W. Wilson_