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 A138206 #18 Jun 23 2025 03:41:02 %S A138206 30030,11243154,323567034,7933641735,45212320502,626804494291, %T A138206 7563009743844,83793300096830,395732828592408 %N A138206 a(n) is the first term in a chain of at least n consecutive numbers each with exactly 6 distinct prime factors. %C A138206 a(8) > 10^13. - _Donovan Johnson_, Jan 15 2009 %C A138206 a(10) > 2 * 10^15. - _Toshitaka Suzuki_, Jun 23 2025 %H A138206 Roger B. Eggleton and James A. MacDougall, <a href="http://www.jstor.org/stable/27643119">Consecutive integers with equally many principal divisors</a>, Math. Mag. 81 (2008), 235-248. [_T. D. Noe_, Oct 13 2008] %Y A138206 Cf. A087977, A087978, A138207. %Y A138206 Cf. A154573. [_Donovan Johnson_, Jan 15 2009] %K A138206 nonn,more %O A138206 1,1 %A A138206 _Donovan Johnson_, Mar 06 2008 %E A138206 a(6)-a(7) from _Donovan Johnson_, Jan 15 2009 %E A138206 a(8) from _Toshitaka Suzuki_, Apr 06 2025 %E A138206 a(9) from _Toshitaka Suzuki_, Jun 23 2025