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 A143716 #15 Mar 22 2016 10:25:50 %S A143716 1,2,3,4,15625,7,72,10,313842837672,393737638569928,240,17, %T A143716 14164706907106753527152640 %N A143716 (0, 1, 2, 3, 2^2, 5, 2*3, 7, 2^3, 3^2, 2*5, 11, 2^2*3,..) becomes (1, 2, 3, 4, 5^6, 7, 8*9, 10, 11^12, 13^14, 15*16, 17, 18^19*20,..). %C A143716 The list of the bases and exponents of the prime factorizations is replaced by the list of positive integers, but the operations stay fixed. - _R. J. Mathar_, Mar 22 2016 %e A143716 a(5)=5^6=15625. %e A143716 a(6)=7. %e A143716 a(7)=8*9=72. %Y A143716 Cf. A141287, A141261, A136611. %K A143716 nonn %O A143716 1,2 %A A143716 _Juri-Stepan Gerasimov_, Nov 13 2008 %E A143716 Definition and terms corrected. - _R. J. Mathar_, Mar 22 2016