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Search: id:A152083
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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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+0
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
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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This sequence is well-defined only up to n=3999 (=MMMCMXCIX, a(3999)=5600).
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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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Sequence in context: A021276 A067753 A129023 this_sequence A003458 A133339 A112267
Adjacent sequences: A152080 A152081 A152082 this_sequence A152084 A152085 A152086
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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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