A131480 -id:A131480 - cp's OEIS frontend

A133194 Numbers requiring a prime number of chisel strokes for their representation in Roman numerals.

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, 49, 50, 51, 53, 54, 56, 58, 59, 61, 63, 64, 66, 69, 71, 78, 83, 84, 86, 88, 89, 91, 93, 94, 96, 99, 100, 101, 103, 104, 106, 108, 109, 111, 113, 114, 116, 119, 121

Offset: 1

Jonathan Vos Post, Oct 09 2007

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.

			a(1) = 2 because II requires 2 strokes (neglecting serifs).
a(44) = 88 because LXXXVIII requires 13 strokes.

Nathaniel Johnston, Table of n, a(n) for n = 1..1215 (complete up to 3999)

Cf. A000040, A002963, A105269, A131480.

A002963(a(n)) is in A000040.

cp's OEIS Frontend

A133194 Numbers requiring a prime number of chisel strokes for their representation in Roman numerals.

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