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 A251539 First differences of A251538. 6
 4, 4, 4, 4, 4, 4, 4, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 2, 4, 4, 4, 4, 4, 4, 4, 4, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 4, 4 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS I would very much like to have a formula or recurrence for this sequence. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..100000 MATHEMATICA max = 1000 (* = max term of A251538 *); A098548 = {1, 2, 3}; For[n = 4, n <= 8 max, n++, If[GCD[n, A098548[[-1]]] == 1 && GCD[n, A098548[[-2]]] > 1, AppendTo[A098548, n]]]; A251538 = Select[Range[max], A098548[[2#+3]] > A098548[[2#+1]] + 6&]; Differences[A251538] (* Jean-François Alcover, Aug 01 2018 *) PROG (Haskell) a251539 n = a251539_list !! (n-1) a251539_list = zipWith (-) (tail a251538_list) a251538_list -- Reinhard Zumkeller, Dec 08 2014 CROSSREFS Cf. A098548, A251535-A251538. Cf. A251767 (duplicates removed), A251768 (run lengths). Sequence in context: A136213 A088848 A088849 * A123932 A010709 A138908 Adjacent sequences: A251536 A251537 A251538 * A251540 A251541 A251542 KEYWORD nonn AUTHOR N. J. A. Sloane, Dec 07 2014 STATUS approved

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Last modified December 9 18:21 EST 2022. Contains 358703 sequences. (Running on oeis4.)