A062726 Numbers that do not contain repeated letters when written in Roman numerals.

1, 4, 5, 6, 9, 10, 11, 14, 15, 16, 40, 41, 44, 45, 46, 50, 51, 54, 55, 56, 59, 60, 61, 64, 65, 66, 90, 91, 94, 95, 96, 100, 101, 104, 105, 106, 109, 110, 111, 114, 115, 116, 140, 141, 144, 145, 146, 150, 151, 154, 155, 156, 159, 160, 161, 164, 165, 166, 400, 401, 404

Offset

1,2

Links

Sean A. Irvine, Table of n, a(n) for n = 1..316

P. Lewis, Roman numerals and calendar

Example

9 is OK because when written in Roman numerals it is IX and has no letter repeated.
The largest possible term is a(316) = 1666 = MDCLXVI. - Sean A. Irvine, Apr 07 2023

Crossrefs

Cf. A006968.

Sequence in context: A177103 A114454 A008854 * A159629 A328173 A223138

Adjacent sequences: A062723 A062724 A062725 * A062727 A062728 A062729

Keyword

nonn,base,fini,full

Author

Rodolfo Kurchan, Jul 11 2001

Extensions

Corrected and extended by Larry Reeves (larryr(AT)acm.org), Jul 23 2001

Status

approved