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 A086560 #18 Nov 06 2021 06:37:09 %S A086560 2,5,64,1867,491851,17681491,35565206671,43194825904693 %N A086560 Start of first run of n successive numbers in which i-th number has exactly i distinct prime divisors for i = 1..n. %D A086560 J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 64, p. 23, Ellipses, Paris 2008. %e A086560 a(3) = 64, as 64 has 1, 65 has 2 and 66 has 3 prime divisors: 64 = 2^6, 65 = 5*13 and 66 = 2*3*11. %Y A086560 Cf. A001221, A072875. %K A086560 nonn,hard,more %O A086560 1,1 %A A086560 _Amarnath Murthy_, Aug 30 2003 %E A086560 More terms from _Don Reble_, Sep 13 2003 %E A086560 a(7) from _Donovan Johnson_, Mar 06 2008 %E A086560 a(8) from _Donovan Johnson_, Jul 19 2011