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 A047738 #17 Feb 16 2025 08:32:39 %S A047738 179210312,179210313,179210314,179210315 %N A047738 Earliest sequence of 4 consecutive economical numbers. %H A047738 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/NonRecursions.html">Non Recursions</a> %H A047738 J.-M. De Koninck and F. Luca, <a href="https://www.emis.de/journals/INTEGERS/papers/a5int2003/a5int2003.Abstract.html">On strings of consecutive economical numbers of arbitrary length</a>, Integers: Electronic Journal of Combinatorial Number Theory 5, (2005), #A5. %H A047738 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/EconomicalNumber.html">Economical Number</a> %e A047738 179210312 = 2^3* 4733^2; 9 digits in 179219312, 7 digits in its prime factorization, 7 < 9, so that number is economical. %Y A047738 Cf. A046759. %K A047738 fini,full,nonn,base %O A047738 1,1 %A A047738 _Carlos Rivera_