A076362 Smallest x such that A061498(x)=n: least number in dRRS of which n distinct term occur.

1, 3, 9, 15, 385, 105, 3003, 1155, 51051, 36465, 15015, 692835, 440895, 255255, 10140585, 8580495, 4849845

Offset

0,2

Comments

Is it a rule that in each dRRS[a(n)], distinct differences are {1,2,...,n}?

No more terms up to 2*10^5. - Michel Marcus, Mar 26 2020

a(17) > 2.4*10^7. a(18) <= 248834355, a(19) <= 190285095, a(20) <= 111546435. - Giovanni Resta, Apr 13 2020

Links

Table of n, a(n) for n=0..16.

Formula

a(n) = Min{x; A061498(x)=n}.

Example

n=5, a(5)=105 because in dRRS[105]={1,2,4,3,2,....,1,5,...,2,1} five distinct terms[=consecutive residue-differences] occur, namely: {1,2,3,4,5}.

Mathematica

gw[x_] := Table[GCD[w, x], {w, 1, x}] rrs[x_] := Flatten[Position[gw[x], 1]] dr[x_] := Delete[RotateLeft[rrs[x]]-rrs[x], -1] did[x_] := Length[Union[dr[x]]] t=Table[0, {25}]; Do[s=did[n]; If[s<258&&t[[s]]==0, t[[s]]=n], {n, 1, 100000}]; t

Crossrefs

Cf. A061498, A000010.

Sequence in context: A272621 A134137 A174179 * A336970 A366051 A070066

Adjacent sequences: A076359 A076360 A076361 * A076363 A076364 A076365

Keyword

nonn,more,changed

Author

Labos Elemer, Oct 09 2002

Extensions

a(8)-a(10) from Michel Marcus, Mar 25 2020

a(11)-a(16) from Giovanni Resta, Apr 13 2020

Status

approved