A098552 - OEIS

A098552

A098550(A098550(n)).

1, 2, 3, 4, 5, 14, 7, 16, 9, 8, 26, 12, 34, 10, 15, 6, 39, 22, 28, 11, 30, 25, 35, 24, 45, 95, 51, 23, 85, 21, 20, 123, 33, 75, 55, 64, 65, 88, 17, 69, 91, 58, 27, 63, 78, 42, 81, 49, 54, 50, 13, 40, 102, 48, 72, 44, 111, 46, 41, 31, 32, 18, 56, 92, 93, 94, 77, 74, 52, 112, 62

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OFFSET

1,2

COMMENTS

Integer permutation with inverse A098553; A098551(a(n)) = a(A098551(n)) = A098550(n).

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[lst_List] := Block[{k = 4}, While[ GCD[ lst[[-2]], k] == 1 || GCD[ lst[[-1]], k] > 1 || MemberQ[lst, k], k++]; Append[lst, k]]; lst[[#]] & /@ Take[lst = Nest[f, {1, 2, 3}, 120], 71] (* Robert G. Wilson v, Nov 21 2014 *)

PROG

(Haskell)

a098552 = a098550 . a098550 -- Reinhard Zumkeller, Nov 21 2014

CROSSREFS

Cf. A098550, A098553.

Sequence in context: A057158 A138986 A306294 * A245447 A361947 A037340

Adjacent sequences: A098549 A098550 A098551 * A098553 A098554 A098555

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Sep 14 2004

STATUS

approved