A066251 -id:A066251

Search: a066251 -id:a066251

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page 1

A066255

a(n) = A066251(A066251(n)).

+20
1

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 16, 15, 13, 19, 18, 23, 22, 24, 28, 27, 17, 31, 30, 32, 36, 34, 20, 38, 40, 43, 21, 44, 42, 48, 46, 50, 52, 51, 25, 55, 58, 57, 26, 62, 60, 67, 66, 69, 29, 71, 70, 74, 72, 75, 78, 77, 33, 86, 82, 89, 88, 92, 35, 93, 96, 99, 37, 101

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

OFFSET

1,2

COMMENTS

Permutation of natural numbers.

LINKS

Table of n, a(n) for n=1..71.

Index entries for sequences that are permutations of the natural numbers

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Dec 09 2001

STATUS

approved

A066249

Inverse permutation to A066248.

+10
3

3, 1, 5, 2, 7, 4, 8, 6, 9, 10, 11, 12, 13, 16, 14, 18, 15, 22, 17, 28, 19, 30, 20, 36, 21, 40, 23, 42, 24, 46, 25, 52, 26, 58, 27, 60, 29, 66, 31, 70, 32, 72, 33, 78, 34, 82, 35, 88, 37, 96, 38, 100, 39, 102, 41, 106, 43, 108, 44, 112, 45, 126, 47, 130, 48, 136, 49, 138, 50

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

OFFSET

1,1

COMMENTS

Permutation of natural numbers.

LINKS

Table of n, a(n) for n=1..69.

Index entries for sequences that are permutations of the natural numbers

FORMULA

a(n) = (if n is even then A000040(n/2) else A002808((n+1)/2)) - 1.

CROSSREFS

Cf. A066248, A000040, A002808, A066251, A066253.

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Dec 09 2001

STATUS

approved

A066250

a(n) = if n+1 is prime then A049084(n+1)*2 - 1 else A066246(n+1)*2.

+10
3

1, 3, 2, 5, 4, 7, 6, 8, 10, 9, 12, 11, 14, 16, 18, 13, 20, 15, 22, 24, 26, 17, 28, 30, 32, 34, 36, 19, 38, 21, 40, 42, 44, 46, 48, 23, 50, 52, 54, 25, 56, 27, 58, 60, 62, 29, 64, 66, 68, 70, 72, 31, 74, 76, 78, 80, 82, 33, 84, 35, 86, 88, 90, 92, 94, 37, 96, 98, 100, 39, 102

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

OFFSET

1,2

COMMENTS

Permutation of natural numbers; inverse: A066251.

LINKS

Table of n, a(n) for n=1..71.

Index entries for sequences that are permutations of the natural numbers

FORMULA

a(n) = A026238(n+1)*2 - A010051(n+1).

CROSSREFS

Cf. A066251, A049084, A066246, A026238, A010051, A066248, A066254.