a(n) = the smallest positive integer with exactly the same number of divisors as in the first n positive integers combined.

A160996

a(n) = the smallest positive integer with exactly the same number of divisors as in the first n positive integers combined.

Terms

    a(0) =1a(1) =4a(2) =16a(3) =24a(4) =48a(5) =192a(6) =120a(7) =240a(8) =4194304a(9) =900a(10) =268435456a(11) =5184a(12) =68719476736a(14) =3600a(15) =6480a(16) =61440a(17) =805306368a(18) =5040a(19) =46080a(20) =25920a(21) =206158430208a(22) =3932160a(23) =20160a(24) =2415919104a(25) =2985984a(26) =21233664

External references