OFFSET
1,2
COMMENTS
This sequence is well-defined only up to n=3999 (=MMMCMXCIX, a(3999)=5600).
LINKS
Nathaniel Johnston, Table of n, a(n) for n = 1..3999
FORMULA
a(n+5)=a(n)+7
EXAMPLE
For n=4, the Roman numerals up to 4 are I, II, III, IV and these comprise seven I's.
CROSSREFS
KEYWORD
base,easy,fini,nonn,word
AUTHOR
Bryce Herdt (mathidentity(AT)yahoo.com), Nov 23 2008
STATUS
approved