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 A280694 Largest Lucas number (A000032) dividing n. 5
 1, 2, 3, 4, 1, 3, 7, 4, 3, 2, 11, 4, 1, 7, 3, 4, 1, 18, 1, 4, 7, 11, 1, 4, 1, 2, 3, 7, 29, 3, 1, 4, 11, 2, 7, 18, 1, 2, 3, 4, 1, 7, 1, 11, 3, 2, 47, 4, 7, 2, 3, 4, 1, 18, 11, 7, 3, 29, 1, 4, 1, 2, 7, 4, 1, 11, 1, 4, 3, 7, 1, 18, 1, 2, 3, 76, 11, 3, 1, 4, 3, 2, 1, 7, 1, 2, 29, 11, 1, 18, 7, 4, 3, 47, 1, 4, 1, 7, 11, 4, 1, 3, 1, 4, 7, 2, 1, 18, 1, 11, 3, 7, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Antti Karttunen, Table of n, a(n) for n = 1..15127 FORMULA a(n) = n / A280695(n). Other identities. For all n >= 1: a(A000032(n)) = A000032(n). a(A057854(n)) = A280696(A057854(n)). a(A000045(n)) = A280699(n). PROG (Scheme) ;; A stand-alone program: (define (A280694 n) (let loop ((l1 1) (l2 3) (lpd 1)) (cond ((> l1 n) (if (and (= 1 lpd) (even? n)) 2 lpd)) ((zero? (modulo n l1)) (loop l2 (+ l1 l2) l1)) (else (loop l2 (+ l1 l2) lpd))))) CROSSREFS Cf. A000032, A054494, A280695, A280699. Cf. A057854 (gives the positions n > 1 where this sequence and A280696 obtain equal values). Sequence in context: A194742 A159798 A294236 * A270313 A343251 A327464 Adjacent sequences:  A280691 A280692 A280693 * A280695 A280696 A280697 KEYWORD nonn AUTHOR Antti Karttunen, Jan 11 2017 STATUS approved

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Last modified June 21 19:59 EDT 2021. Contains 345365 sequences. (Running on oeis4.)