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A064621 Values of A005132(n) at which the ratio A005132(n)/n sets a new record. 3
1, 3, 6, 13, 20, 62, 113, 224, 367, 494, 833, 9169, 131313, 155719, 180118, 280766754, 3454917187, 31685027464, 152431947617, 629621648241 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A064622 for associated values of n.

No other terms < 4 * 10^12. - Jud McCranie, Dec 29 2019

LINKS

Table of n, a(n) for n=1..20.

Index entries for sequences related to Recamán's sequence

EXAMPLE

A005132(7)=20, 20/7 = 2.857..., larger than the ratio for any smaller value of n.

MATHEMATICA

Block[{s = Nest[Append[#1, If[And[#3 > 0, FreeQ[#1, #3]], #3, #1[[-1]] + #2]] & @@ {#1, #2, #1[[-1]] - #2} & @@ {#, Length@ #} &, {0}, 200000], t}, t = MapIndexed[#1/First@ #2 &, s]; Rest@ Map[s[[FirstPosition[t, #][[1]] ]] &, Union@ FoldList[Max, t]] ] (* Michael De Vlieger, Dec 29 2019 *)

CROSSREFS

Cf. A005132, A064622.

Sequence in context: A147009 A318228 A064290 * A330588 A194279 A293822

Adjacent sequences:  A064618 A064619 A064620 * A064622 A064623 A064624

KEYWORD

more,nonn

AUTHOR

Jud McCranie, Sep 26 2001

EXTENSIONS

Offset changed, a(19)-a(20) from Jud McCranie, Dec 28 2019

STATUS

approved

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Last modified September 21 16:31 EDT 2021. Contains 347598 sequences. (Running on oeis4.)