A118639 Smallest number expressible using the next Roman-numeral symbol under the vinculum system.

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

Offset: 1

Author

Greg Huber, May 09 2006

Keywords

• easy
• nonn
• base
• fini
• full

Examples

			a(1) = I  (first usage of I);
a(2) = IV (first usage of V);
a(3) = IX (first usage of X);
a(4) = XL (first usage of L);
a(5) = XC (first usage of C);
a(6) = CD (first usage of D);
a(7) = CM (first usage of M).
		

Links

• Wikipedia, Roman numerals

Crossrefs

Cf. A003587, A118640.