A115949 - OEIS

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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, 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

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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.