A050122 - OEIS

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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.

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 fl = n then` `return true;` `elif fl > 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.)