A051733 - OEIS

A051733

Numbers n such that A051732(n) = n-1.

2, 3, 6, 7, 10, 15, 19, 27, 30, 31, 34, 42, 51, 54, 66, 70, 75, 82, 87, 90, 91, 99, 106, 114, 135, 147, 159, 174, 175, 187, 190, 195, 210, 211, 222, 231, 234, 246, 255, 262, 271, 274, 279, 282, 294, 307, 310, 327, 330, 331, 339, 351, 355, 379, 387, 394, 399, 411, 414

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Olivier Gérard and Vincenzo Librandi, Table of n, a(n) for n = 1..6000 (first 386 terms from Olivier Gérard).

MATHEMATICA

(* v8 *) Select[Range[2, 4000], Function[n, Sort[First[First[PermutationCycles@Join[Table[2r-1, {r, 1, n}], Table[2r-2n, {r, n+1, 2n}]]]]]==Range[2, 2n-1]]] (* Olivier Gérard, Nov 08 2012 *)

CROSSREFS

Cf. A051732. Equals A217948(n)/2.

Sequence in context: A343604 A288672 A086495 * A058632 A086583 A107852

Adjacent sequences: A051730 A051731 A051732 * A051734 A051735 A051736

KEYWORD

easy,nonn

AUTHOR

Marie-Christine Haton (Marie-Christine.Haton(AT)loria.fr)

STATUS

approved