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%I #5 Mar 30 2012 18:40:43
%S 2,3,4,5,6,8,9,10,11,13,14,16,18,19,21,23,24,26,29,31,38,41,43,44,46,
%T 49,50,51,53,54,56,58,59,61,63,64,66,69,71,78,83,84,86,88,89,91,93,94,
%U 96,99,100,101,103,104,106,108,109,111,113,114,116,119,121
%N Numbers requiring a prime number of chisel strokes for their representation in Roman numerals.
%C Finite if one excludes multiple strokes chiseled over the letter, each meaning multiplication by 1000. The subsequence "primes requiring a prime number of chisel strokes for its representation in Roman numerals" begins 2, 3, 5, 11, 13, 19, 23, 29, 31, 41, 43, 53, 59, 61, 71, 83, 89, 101, 103. This sequence uses the definition of strokes given in A002963, not A118098.
%H Nathaniel Johnston, <a href="/A133194/b133194.txt">Table of n, a(n) for n = 1..1215</a> (complete up to 3999)
%F A002963(a(n)) is in A000040.
%e a(1) = 2 because II requires 2 strokes (neglecting serifs).
%e a(44) = 88 because LXXXVIII requires 13 strokes.
%Y Cf. A000040, A002963, A105269, A131480.
%K base,easy,nonn
%O 1,1
%A _Jonathan Vos Post_, Oct 09 2007
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