This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A133194 #5 Mar 30 2012 18:40:43 %S A133194 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 A133194 49,50,51,53,54,56,58,59,61,63,64,66,69,71,78,83,84,86,88,89,91,93,94, %U A133194 96,99,100,101,103,104,106,108,109,111,113,114,116,119,121 %N A133194 Numbers requiring a prime number of chisel strokes for their representation in Roman numerals. %C A133194 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 A133194 Nathaniel Johnston, <a href="/A133194/b133194.txt">Table of n, a(n) for n = 1..1215</a> (complete up to 3999) %F A133194 A002963(a(n)) is in A000040. %e A133194 a(1) = 2 because II requires 2 strokes (neglecting serifs). %e A133194 a(44) = 88 because LXXXVIII requires 13 strokes. %Y A133194 Cf. A000040, A002963, A105269, A131480. %K A133194 base,easy,nonn %O A133194 1,1 %A A133194 _Jonathan Vos Post_, Oct 09 2007