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A002904 Delete all letters except c,d,i,l,m,v,x from n then read as Roman numeral if possible, otherwise 0. 4
0, 0, 0, 0, 4, 9, 5, 1, 1, 0, 55, 55, 1, 0, 1, 9, 5, 1, 1, 0, 0, 0, 0, 0, 4, 9, 5, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..34.

Brady Haran and Neil Sloane, What Number Comes Next? (2018), Numberphile video

CROSSREFS

See A092302 and A121305 for other versions.

Sequence in context: A087369 A200629 A021206 * A121305 A200396 A011513

Adjacent sequences:  A002901 A002902 A002903 * A002905 A002906 A002907

KEYWORD

nonn,word

AUTHOR

J. H. Conway

EXTENSIONS

Ambiguous or ill-defined beyond the last term shown.

STATUS

approved

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Last modified March 23 18:13 EDT 2019. Contains 321433 sequences. (Running on oeis4.)