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A094109 Start with "I" in Roman numerals (one). The next number (in Roman numerals) describes the number of Roman numerals written previously in the sequence. Convert this infinite sequence into an infinite sequence of Arabic numbers. 1
1, 1, 2, 4, 6, 8, 12, 15, 17, 21, 24, 28, 34, 39, 44, 48, 54, 57, 61, 64, 68, 74, 79, 84, 90, 92, 96, 100, 101, 103, 107, 111, 114, 118, 124, 129, 134, 140, 143, 149, 154, 158, 164, 169, 174, 180, 185, 191, 195, 199, 204, 208, 214, 219, 224, 230, 235, 241 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
FORMULA
a(n) = a(n-1) + A006968(a(n-1)) for n >= 3. - Nathaniel Johnston, May 18 2011
EXAMPLE
The sequence begins I, I, II, IV, VI, VIII, XII, XV, XVII, XXI, XXIV, XXVIII, XXXIV, XXIX, XLIII, XLVIII, LIV, LVII, LXI, LXIV, ...
MAPLE
A094109 := proc(n) option remember: if(n<=2)then return 1:fi: return procname(n-1) + length(convert(procname(n-1), roman)): end: seq(A094109(n), n=1..58); # Nathaniel Johnston, May 18 2011
CROSSREFS
See A006968 for how to spell the Roman numerals.
Sequence in context: A131197 A078327 A214415 * A338361 A090404 A015937
KEYWORD
nonn,base
AUTHOR
Eric Angelini, May 03 2004
EXTENSIONS
Extended by Nathaniel Johnston, May 18 2011
STATUS
approved

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Last modified March 29 06:15 EDT 2024. Contains 371265 sequences. (Running on oeis4.)