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A050122 a(n) = n-th number of the form F(i)*L(j), i<=j, when these products of Fibonacci and Lucas numbers are ordered, without duplicates. 2
0, 1, 3, 4, 7, 8, 11, 14, 18, 21, 22, 29, 33, 36, 47, 54, 55, 58, 76, 87, 90, 94, 123, 141, 144, 145, 152, 199, 228, 232, 235, 246, 322, 369, 376, 377, 380, 398, 521, 597, 608, 611, 615, 644, 843, 966, 984, 987, 988, 995, 1042, 1364 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

R. J. Mathar, Table of n, a(n) for n = 1..171

MAPLE

isA050122 := proc(n)

    local i, j, f, l ;

    if n =0 then

        true;

    else

        for i from 1 do

            f := A000045(i) ;

            if f > n then

                return false;

            else

                for j from i do

                    l := A000032(j) ;

                    if f*l = n then

                        return true;

                    elif f*l > n and j> 2 then

                        break;

                    end if;

                end do:

            end if;

        end do:

    end if;

end proc:

A050122 := proc(n)

    option remember;

    local a;

    if n = 1 then

        0;

    else

        for a from procname(n-1)+1 do

            if isA050122(a) then

                return a;

            end if;

        end do:

    end if;

end proc:

seq(A050122(n), n=1..80) ; # R. J. Mathar, Jan 04 2017

CROSSREFS

Cf. A000032, A000045.

Sequence in context: A133675 A332068 A173467 * A179016 A003657 A003644

Adjacent sequences:  A050119 A050120 A050121 * A050123 A050124 A050125

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified April 12 15:00 EDT 2021. Contains 342921 sequences. (Running on oeis4.)