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Search: id:A133194
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| A133194 |
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Numbers requiring a prime number of chisel strokes for their representation in Roman numerals. |
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+0
1
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| 2, 3, 4, 5, 6, 8, 9, 10, 11, 13, 14, 16, 18, 19, 21, 23, 24, 26, 29, 31, 38, 41, 43, 44, 46, 49, 50, 51, 53, 54, 56, 58, 59, 61, 63, 64, 66, 69, 71, 78, 83, 84, 86, 88, 89, 91, 93, 94, 96, 99, 100, 101, 103, 104, 106
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Finite if one excludes multiple strokes chiseled over the letter, each meaning multiplication by 1000. The subsequence "primes requiring a prime number of chisel strokes for its representation in Roman numerals" begins 2, 3, 5, 11, 13, 19, 23, 29, 31, 41, 43, 53, 59, 61, 71, 83, 89, 101, 103. The definition of strokes in A002963 differs from that in A118098.
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FORMULA
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A002963(a(n)) is in A000040.
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EXAMPLE
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a(1) = 2 because II requires 2 strokes (neglecting serifs).
a(44) = 88 because LXXXVIII requires 13 strokes.
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CROSSREFS
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Cf. A000040, A002963, A105269, A131480.
Sequence in context: A039216 A091208 A068398 this_sequence A022774 A153134 A045546
Adjacent sequences: A133191 A133192 A133193 this_sequence A133195 A133196 A133197
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KEYWORD
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base,easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), Oct 09 2007
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