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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
| 1,1
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COMMENTS
| 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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EXAMPLE
| 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
| Cf. A071062, minimal set of prime-strings in base 10.
Sequence in context: A087185 A127010 A140547 * A018847 A178318 A134996
Adjacent sequences: A131477 A131478 A131479 * A131481 A131482 A131483
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KEYWORD
| base,nonn
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AUTHOR
| Robert Happelberg (roberthappelberg(AT)yahoo.com), Jul 27 2007
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