

A131480


Minimal set of primestrings in Roman numerals.


1




OFFSET

1,1


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.


LINKS

Table of n, a(n) for n=1..9.


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).


CROSSREFS

Cf. A071062, minimal set of primestrings in base 10.
Sequence in context: A087185 A127010 A140547 * A262228 A213073 A267527
Adjacent sequences: A131477 A131478 A131479 * A131481 A131482 A131483


KEYWORD

base,nonn


AUTHOR

Robert Happelberg (roberthappelberg(AT)yahoo.com), Jul 27 2007


STATUS

approved



