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A152083 Number of occurrences of "I" in all Roman numerals of numbers from 1 to n 1

%I

%S 1,3,6,7,7,8,10,13,14,14,15,17,20,21,21,22,24,27,28,28,29,31,34,35,35,

%T 36,38,41,42,42,43,45,48,49,49,50,52,55,56,56,57,59,62,63,63,64,66,69,

%U 70,70,71,73,76,77,77,78,80,83,84,84,85,87,90,91,91,92

%N Number of occurrences of "I" in all Roman numerals of numbers from 1 to n

%C This sequence is well-defined only up to n=3999 (=MMMCMXCIX, a(3999)=5600).

%H Nathaniel Johnston, <a href="/A152083/b152083.txt">Table of n, a(n) for n = 1..3999</a>

%F a(n+5)=a(n)+7

%e For n=4, the Roman numerals up to 4 are I, II, III, IV and these comprise seven I's.

%K base,easy,fini,nonn,word

%O 1,2

%A Bryce Herdt (mathidentity(AT)yahoo.com), Nov 23 2008

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