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A152083
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Number of occurrences of "I" in all Roman numerals of numbers from 1 to n
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1
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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
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1,2
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COMMENTS
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This sequence is well-defined only up to n=3999 (=MMMCMXCIX, a(3999)=5600).
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LINKS
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FORMULA
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a(n+5)=a(n)+7
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EXAMPLE
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For n=4, the Roman numerals up to 4 are I, II, III, IV and these comprise seven I's.
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CROSSREFS
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KEYWORD
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base,easy,fini,nonn,word
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AUTHOR
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Bryce Herdt (mathidentity(AT)yahoo.com), Nov 23 2008
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STATUS
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approved
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