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 A105417 Numbers that are pandigital in Roman numerals, using each of the symbols I, V, X, L, C, D and M at least once. 2
 1444, 1446, 1447, 1448, 1464, 1466, 1467, 1468, 1474, 1476, 1477, 1478, 1484, 1486, 1487, 1488, 1644, 1646, 1647, 1648, 1664, 1666, 1667, 1668, 1674, 1676, 1677, 1678, 1684, 1686, 1687, 1688, 1744, 1746, 1747, 1748, 1764, 1766, 1767, 1768, 1774, 1776 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Contains A105416. The largest member of this sequence is 3888, MMMDCCCLXXXVIII. From Daniel Forgues, Jul 31 2011: (Start)   There are 192 = 3 * 4^3 pandigital Roman numerals:   3 ways to start: M*, MM*, MMM* (since no Roman numeral stood for 5000)   4 ways for the hundreds: *CD*, *DC*, *DCC*, *DCCC*   4 ways for the decades: *XL*, *LX*, *LXX*, *LXXX*   4 ways for the units: *IV, *VI, *VII, *VIII (End) Equivalently, numbers of the form abcd with 1 <= a <= 3 and b,c,d in {4,6,7,8}. - M. F. Hasler, Jul 10 2018 LINKS Nathaniel Johnston, Table of n, a(n) for n = 1..192 (full sequence) FORMULA A006968(a(n)) >= 7. - Reinhard Zumkeller, Apr 14 2013 EXAMPLE a(3) = 1447 because its Roman numeral representation, MCDXLVII, uses each of the symbols V, X, L, C, D and M once and the symbol I twice. MAPLE with(StringTools): for n from 1 to 3999 do r:=convert(n, roman): if Search("I", r) > 0 and Search("V", r) > 0 and Search("X", r) > 0 and Search("L", r) > 0 and Search("C", r) > 0 and Search("D", r) > 0 and Search("M", r) > 0 then printf("%d, ", n): fi: od: # Nathaniel Johnston, May 18 2011 A105417 := select(n->nops(convert(convert(n, roman), set))=7, `\$`(3888)) # M. F. Hasler, Jul 10 2018 PROG (Haskell) import Data.List (nub, sort) a105417 n = a105417_list !! (n-1) a105417_list = filter ((== "1234567") . sort . nub . show . a061493) [1..3999] -- Reinhard Zumkeller, Apr 14 2013 (PARI) A105417=vector(192, i, fromdigits(apply(d->d-!d, digits(i+63, 4)))+555) \\ M. F. Hasler, Jul 10 2018 CROSSREFS Cf. A061493, A105416. Sequence in context: A252224 A221872 A251842 * A105416 A298222 A180465 Adjacent sequences:  A105414 A105415 A105416 * A105418 A105419 A105420 KEYWORD base,fini,full,easy,nonn AUTHOR Robert Happelberg (roberthappelberg(AT)yahoo.com), Apr 06 2005 STATUS approved

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Last modified October 19 04:40 EDT 2019. Contains 328211 sequences. (Running on oeis4.)