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A115949 a(1)=1 and a(n)=least positive integer not yet in sequence, if n is even and a(n) = sum of least two positive integers not yet in sequence, if n is odd. 1
1, 2, 7, 3, 9, 4, 11, 5, 14, 6, 18, 8, 22, 10, 25, 12, 28, 13, 31, 15, 33, 16, 36, 17, 39, 19, 41, 20, 44, 21, 47, 23, 50, 24, 53, 26, 56, 27, 59, 29, 62, 30, 66, 32, 69, 34, 72, 35, 75, 37, 78, 38, 82, 40, 85, 42, 88, 43, 91, 45, 94, 46, 97, 48, 100, 49, 103, 51, 106, 52, 109 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A permutation of the positive integers.

LINKS

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

EXAMPLE

a(2)=2 because 2 is not 1.

a(3)=7 because two least pos. ints. not in {1,2} are 3 and 4.

a(4)=3 because 3 is not in {1,2,7}.

a(5)=9 because two least pos. ints. not in {1,2,7} are 4 and 5.

CROSSREFS

Cf. A115950.

Sequence in context: A199160 A091694 A086310 * A209121 A021891 A256614

Adjacent sequences:  A115946 A115947 A115948 * A115950 A115951 A115952

KEYWORD

nonn

AUTHOR

Clark Kimberling, Feb 02 2006

STATUS

approved

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Last modified September 17 05:34 EDT 2021. Contains 347478 sequences. (Running on oeis4.)