A118639 - OEIS

%I #11 Jun 03 2021 02:04:54

%S 1,4,9,40,90,400,900,4000,9000,40000,90000,400000,900000

%N Smallest number expressible using the next Roman-numeral symbol.

%e a(2) = IV (first usage of V);

%e a(4) = XL (first usage of L).

%Y Cf. A118640.

%K easy,nonn,base,fini,full

%O 1,2

%A _Greg Huber_, May 09 2006