|
| |
|
|
A081146
|
|
Inverse permutation to A081145.
|
|
5
|
|
|
|
1, 2, 5, 3, 8, 11, 4, 6, 14, 17, 20, 9, 23, 7, 26, 12, 29, 32, 35, 10, 15, 38, 40, 43, 18, 46, 13, 21, 49, 52, 55, 58, 24, 16, 61, 64, 27, 67, 70, 72, 19, 30, 75, 77, 33, 80, 22, 36, 83, 86, 89, 92, 95, 25, 39, 98, 101, 41, 104, 28, 44, 107, 110, 113, 116, 47, 119, 31, 122
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,2
|
|
|
LINKS
|
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
Index entries for sequences that are permutations of the natural numbers
|
|
|
MATHEMATICA
|
f[s_] := Block[{d = Abs[Rest@s - Most@s], k = 1}, While[ MemberQ[d, Abs[k - Last@s]] || MemberQ[s, k], k++ ]; Append[s, k]]; t = Nest[f, {1}, 130]; Table[ Position[t, n], {n, 70}] // Flatten (* Robert G. Wilson v, Jun 09 2006 *)
f[s_] := Block[{k = 1, d = Abs[Most@s - Rest@s], l = Last@s}, While[MemberQ[s, k] || MemberQ[d, Abs[l - k]], k++ ]; Append[s, k]]; t = Nest[f, {1}, 125]; Table[Position[t, n], {n, 71}] // Flatten (* Robert G. Wilson v, Jun 13 2006 *)
|
|
|
PROG
|
(Haskell)
import Data.List (elemIndex); import Data.Maybe (fromJust)
a081146 = (+ 1) . fromJust . (`elemIndex` a081145_list)
-- Reinhard Zumkeller, Jul 02 2015
|
|
|
CROSSREFS
|
Cf. A081145.
Sequence in context: A309557 A292965 A302054 * A261927 A262870 A294210
Adjacent sequences: A081143 A081144 A081145 * A081147 A081148 A081149
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
Don Reble, Mar 08 2003
|
|
|
STATUS
|
approved
|
| |
|
|
