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%I #1 Nov 10 2007 03:00:00
%S 2,5,11,59,101,509,1009,1051,3001
%N Minimal set of prime-strings in Roman numerals.
%C Written in Roman numerals this sequence begins II, V, XI, LIX, CI, DIX, MIX, MLI, MMMI.
%C 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.
%e 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).
%Y Cf. A071062, minimal set of prime-strings in base 10.
%K base,nonn
%O 1,1
%A Robert Happelberg (roberthappelberg(AT)yahoo.com), Jul 27 2007
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