login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

Smallest composite with n prime factors that are distinct in length.
0

%I #9 Oct 13 2019 00:02:09

%S 1,22,2222,2241998,22435673986,2243634705621958,

%T 2243641436526074865874,22436456994448042654162451606,

%U 2243645856500003226552543739737161242,2243645872205524222052566325604967420160128694

%N Smallest composite with n prime factors that are distinct in length.

%t p = 2; Join[{1}, Table[p = p*Prime[PrimePi[10^n] + 1], {n, 9}]] (* _Jayanta Basu_, Jun 24 2013 *)

%Y Cf. A003617, A033873. Initial terms of A046442, A046443, A046444.

%K nonn,base

%O 0,2

%A _Patrick De Geest_, Jul 15 1998

%E Corrected by _Jayanta Basu_, Jun 24 2013