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A272909 Numbers that are the product of two Lucas numbers L(i), for i >= 1, using the Lucas numbers as defined in A000204. 6
1, 3, 4, 7, 9, 11, 12, 16, 18, 21, 28, 29, 33, 44, 47, 49, 54, 72, 76, 77, 87, 116, 121, 123, 126, 141, 188, 198, 199, 203, 228, 304, 319, 322, 324, 329, 369, 492, 517, 521, 522, 532, 597, 796, 836, 841, 843, 846, 861, 966, 1288, 1353, 1363, 1364, 1368, 1393 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Conjecture: if c and d are consecutive terms, then d - c is a product of two Lucas numbers or a product of two Fibonacci numbers.
LINKS
MATHEMATICA
Take[Union@Flatten@Table[LucasL[i] LucasL[j], {i, 0, 15}, {j, i}], 60] (* adapted by Vincenzo Librandi, Sep 04 2016 *)
CROSSREFS
Cf. A049997 (Fibonacci(i)*Fibonacci(j)), A000204.
Sequence in context: A288634 A284776 A047544 * A035267 A309133 A245239
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, May 10 2016
STATUS
approved

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Last modified July 23 09:37 EDT 2024. Contains 374547 sequences. (Running on oeis4.)