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A100748
Years of recorded appearances of Halley's Comet (negative years are B.C.).
1
-240, -164, -86, -11, 66, 141, 218, 295, 374, 451, 530, 607, 684, 760, 837, 912, 989, 1066, 1145, 1222, 1301, 1378, 1456, 1531, 1607, 1682, 1759, 1835, 1910, 1985
OFFSET
1,1
COMMENTS
This sequence is not well-defined for many reasons (negative years are ill-defined; calendars change often, so when does a year begin?; what does "observed" mean?; what if the comet was observed both at the end of one year and at the beginning of another, as in 1985/1986?; etc.). - N. J. A. Sloane, Jun 24 2007
EXAMPLE
a(30) = 1985 because the 30th recorded appearance of Halley's comet was in 1985.
CROSSREFS
See A072235 for another version.
Sequence in context: A299587 A078151 A278179 * A072235 A298453 A121378
KEYWORD
sign
AUTHOR
David Terr, Jan 03 2005
STATUS
approved