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 A274347 Products of two distinct Lucas numbers (3,4,7,11,18,...). 4
 12, 21, 28, 33, 44, 54, 72, 77, 87, 116, 126, 141, 188, 198, 203, 228, 304, 319, 329, 369, 492, 517, 522, 532, 597, 796, 836, 846, 861, 966, 1288, 1353, 1363, 1368, 1393, 1563, 2084, 2189, 2204, 2214, 2254, 2529, 3372, 3542, 3567, 3572, 3582, 3647, 4092 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS L(i)*L(j) = L(i+j) + (-1)^i*L(j-i). - Robert Israel, Sep 02 2019 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 EXAMPLE 12 = 3*4, 21 = 3*7. MAPLE L:= gfun:-rectoproc({f(n+1)=f(n)+f(n-1), f(0)=2, f(1)=1}, f(n), remember): Q:= proc(n) local j; op(sort([seq(L(n)+(-1)^j*L(n-2*j), j=2..(n-1)/2)])) end proc: map(Q, [\$5..20]); # Robert Israel, Sep 02 2019 MATHEMATICA z = 100; f[n_] := LucasL[n]; Take[Sort[Flatten[Table[f[u] f[v], {u, 2, z}, {v, 2, u - 1}]]], z] CROSSREFS Cf. A000032, A274348, A274349, A271354. Sequence in context: A327297 A371464 A199981 * A316266 A179899 A085926 Adjacent sequences: A274344 A274345 A274346 * A274348 A274349 A274350 KEYWORD nonn,easy AUTHOR Clark Kimberling, Jun 18 2016 STATUS approved

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Last modified April 22 17:45 EDT 2024. Contains 371906 sequences. (Running on oeis4.)