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A118639
Smallest number expressible using the next Roman-numeral symbol.
0
1, 4, 9, 40, 90, 400, 900, 4000, 9000, 40000, 90000, 400000, 900000
OFFSET
1,2
EXAMPLE
a(2) = IV (first usage of V);
a(4) = XL (first usage of L).
CROSSREFS
Cf. A118640.
Sequence in context: A149157 A149158 A142239 * A149159 A149160 A149161
KEYWORD
easy,nonn,base,fini,full
AUTHOR
Greg Huber, May 09 2006
STATUS
approved