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A075567 Rearrangement of natural numbers by choosing alternately odd and even numbers such that every partial sum is composite. 1
9, 6, 1, 2, 3, 4, 5, 8, 7, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) = n for n > 9.

LINKS

Table of n, a(n) for n=1..72.

Index entries for linear recurrences with constant coefficients, signature (2,-1).

PROG

(PARI) a(n)=if(n>9, n, [9, 6, 1, 2, 3, 4, 5, 8, 7][n]) \\ Charles R Greathouse IV, Sep 02 2011

CROSSREFS

Cf. A075566.

Sequence in context: A011114 A298243 A020783 * A019883 A085574 A194825

Adjacent sequences:  A075564 A075565 A075566 * A075568 A075569 A075570

KEYWORD

nonn,easy

AUTHOR

Amarnath Murthy, Sep 25 2002

EXTENSIONS

Extended by Ray Chandler, Feb 13 2005

STATUS

approved

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Last modified December 13 09:48 EST 2019. Contains 329968 sequences. (Running on oeis4.)