

A152083


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


1



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, 36, 38, 41, 42, 42, 43, 45, 48, 49, 49, 50, 52, 55, 56, 56, 57, 59, 62, 63, 63, 64, 66, 69, 70, 70, 71, 73, 76, 77, 77, 78, 80, 83, 84, 84, 85, 87, 90, 91, 91, 92
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OFFSET

1,2


COMMENTS

This sequence is welldefined 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

Sequence in context: A067753 A129023 A188883 * A251532 A251533 A295849
Adjacent sequences: A152080 A152081 A152082 * A152084 A152085 A152086


KEYWORD

base,easy,fini,nonn,word


AUTHOR

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


STATUS

approved



