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A131480
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Minimal set of prime-strings in Roman numerals.
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1
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OFFSET
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1,1
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COMMENTS
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Written in Roman numerals this sequence begins II, V, XI, LIX, CI, DIX, MIX, MLI, MMMI.
For a while I actually considered putting in 97 (XCVII) instead of 101 (CI), since XCVII contains CI as a substring. But it also contains II, V and XI as substrings, so going in order strictly from smallest to greatest, 97 must be excluded.
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LINKS
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EXAMPLE
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a(4) = 59 because it is a prime number and in Roman numerals it's written LIX (all the substrings are composite or not prime: L, LI, LX, I, IX, X).
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CROSSREFS
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Cf. A071062, minimal set of prime-strings in base 10.
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KEYWORD
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base,nonn
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AUTHOR
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Robert Happelberg (roberthappelberg(AT)yahoo.com), Jul 27 2007
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STATUS
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approved
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