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A169983
Number of lunar divisors of the number 999...9 (with n 9's).
1
1, 2, 3, 13, 32, 222, 664, 4355, 20853
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..9.
D. Applegate, M. LeBrun and N. J. A. Sloane,
Dismal Arithmetic
[Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing]
Index entries for sequences related to dismal (or lunar) arithmetic
EXAMPLE
The 13 lunar divisors of 9999 are 9, 99, 909, 919, 929, 939, 949, 959, 969, 979, 989, 999, 9999
CROSSREFS
Cf.
A169982
.
Sequence in context:
A073688
A299967
A216359
*
A151461
A228278
A174742
Adjacent sequences:
A169980
A169981
A169982
*
A169984
A169985
A169986
KEYWORD
nonn
,
more
AUTHOR
David Applegate
,
Marc LeBrun
and
N. J. A. Sloane
, Aug 21 2010
STATUS
approved
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Last modified April 23 23:26 EDT 2024. Contains 371917 sequences. (Running on oeis4.)