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 A003587 Roman numerals with 1 letter, in numerical order; then those with 2 letters, etc. 7
 1, 5, 10, 50, 100, 500, 1000, 2, 4, 6, 9, 11, 15, 20, 40, 51, 55, 60, 90, 101, 105, 110, 150, 200, 400, 501, 505, 510, 550, 600, 900, 1001, 1005, 1010, 1050, 1100, 1500, 2000, 3, 7, 12, 14, 16, 19, 21, 25, 30, 41, 45, 52, 54, 56, 59, 61, 65, 70, 91, 95, 102, 104, 106, 109, 111, 115, 120, 140, 151 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The sequence is finite because 3999 is the largest number that can be written using the symbols I,V,X,L,C,D,M. -  J. Lowell, Nov 17 2020 The Romans had symbols for 5000, 10000, 50000, and 100000, but they have no simple equivalents in our current alphabet. See The Book of Numbers, p. 19. The symbol for 100000 is sometimes represented by (((|))). - N. J. A. Sloane, Nov 28 2020 REFERENCES J. H. Conway and R. K. Guy, The Book of Numbers, Copernicus Press, NY, 1996, p. 19. LINKS EXAMPLE Written in Roman numerals, the sequence reads: I, V, X, L, C, D, M, II, IV, VI, IX, XI, XV, XX, XL, LI, LV, LX, XC, CI, CV, CX, CL, CC, CD, DI, DV, DX, DL, DC, CM, MI, MV, MX, MV, MC, MD, MM, III, VII, XII, ... - M. F. Hasler, Jan 12 2015 PROG (PARI) for(d=1, 4, for(n=d, d*1000, A006968(n)==d && print1(n", "))) \\ M. F. Hasler, Jan 12 2015 CROSSREFS Cf. A003588, A036746, A061493, A006968. Sequence in context: A271275 A270100 A271287 * A268100 A205884 A032088 Adjacent sequences:  A003584 A003585 A003586 * A003588 A003589 A003590 KEYWORD nonn,base,fini AUTHOR N. J. A. Sloane, J. H. Conway and John Jackson (ab158(AT)freenet.uchsc.edu) EXTENSIONS More terms from M. F. Hasler, Jan 12 2015 STATUS approved

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Last modified May 9 13:30 EDT 2021. Contains 343742 sequences. (Running on oeis4.)