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A062726 Numbers that do not contain repeated letters when written in Roman numerals. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..61.

P. Lewis, ROMAN NUMERALS AND DATES

EXAMPLE

9 is OK because when written in Roman numerals it is IX and has no letter repeated.

CROSSREFS

Cf. A006968.

Sequence in context: A177103 A114454 A008854 * A159629 A223138 A287676

Adjacent sequences:  A062723 A062724 A062725 * A062727 A062728 A062729

KEYWORD

nonn,base

AUTHOR

Rodolfo Kurchan, Jul 11 2001

EXTENSIONS

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

STATUS

approved

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Last modified June 25 22:16 EDT 2019. Contains 324358 sequences. (Running on oeis4.)