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Search: id:A082763
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| A082763 |
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Roman numeral contains an asymmetric symbol (L). |
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+0
1
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| 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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I,V,X,C,D,M - and even the vinculum (bar) and apostrophus (backwards "C") - are each symmetric: horizontally, vertically, or both.
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LINKS
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Gerard Schildberger, The first 3999 numbers in Roman numerals
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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FORMULA
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a(n+50) = a(n) + 100 for n >= 1 [a(n+L) = a(n) + C for n >= I], a(1) = 40 [a(I) = XL], a(n+1) = a(n) + 1 for 1 <= n <= 49 [a(n+I) = a(n) + I for I <= n <= XLIX]; so a(n) = floor((n-1)/50)*100 + 40 + ((n-1)(mod 50)) for n >= 1 [a(n) = floor((n-I)/L)*C + XL + ((n-I)(mod L)) for n >= I].
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EXAMPLE
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40 = XL, 89 = LXXXIX, 140 = CXL.
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PROGRAM
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(PARI) /* "%" use below is actually identical to lift(Mod(n-1, 50)) */ /* (n-1)<backslash>50 could be used for integer division below */ /* instead of floor, but the OEIS sometimes loses <backslash> */ /* characters depending upon where on a submitted line they are. */ a(n)=floor((n-1)/50)*100+40+(n-1)%50 for(n=1, 125, print1(a(n), ", "))
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CROSSREFS
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Cf. A006968 (Roman numerals main entry), A078715 (Palindromic Roman numerals).
Sequence in context: A022996 A023482 A165861 this_sequence A007634 A128843 A145293
Adjacent sequences: A082760 A082761 A082762 this_sequence A082764 A082765 A082766
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KEYWORD
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base,easy,nonn
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AUTHOR
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Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 21 2003
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