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A238899
Irregular triangle read by rows: row n lists divisors of n-th Lucas number A000032(n).
1
1, 2, 1, 1, 3, 1, 2, 4, 1, 7, 1, 11, 1, 2, 3, 6, 9, 18, 1, 29, 1, 47, 1, 2, 4, 19, 38, 76, 1, 3, 41, 123, 1, 199, 1, 2, 7, 14, 23, 46, 161, 322, 1, 521, 1, 3, 281, 843, 1, 2, 4, 11, 22, 31, 44, 62, 124, 341, 682, 1364, 1, 2207, 1, 3571, 1, 2, 3, 6, 9, 18, 27, 54
OFFSET
0,2
COMMENTS
Note that, in general, the Lucas numbers have fewer divisors than Fibonacci numbers. Why?
MATHEMATICA
Flatten[Table[Divisors[LucasL[n]], {n, 0, 20}]]
CROSSREFS
Cf. A000032 (Lucas numbers), A027750.
Cf. A133021 (similar triangle for Fibonacci numbers).
Sequence in context: A187846 A181087 A029288 * A187207 A050117 A241187
KEYWORD
nonn,tabf
AUTHOR
T. D. Noe, Mar 14 2014
EXTENSIONS
Typo in Mathematica program corrected by Harvey P. Dale, Jun 29 2021
STATUS
approved