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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 Clark Kimberling, Table of n, a(n) for n = 1..1000 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 Adjacent sequences: A272906 A272907 A272908 * A272910 A272911 A272912 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.)