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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

%I

%S 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,

%T 41,20,44,21,47,23,50,24,53,26,56,27,59,29,62,30,66,32,69,34,72,35,75,

%U 37,78,38,82,40,85,42,88,43,91,45,94,46,97,48,100,49,103,51,106,52,109

%N 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.

%C A permutation of the positive integers.

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

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

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

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

%Y Cf. A115950.

%K nonn

%O 1,2

%A _Clark Kimberling_, Feb 02 2006

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Last modified October 21 02:29 EDT 2021. Contains 348141 sequences. (Running on oeis4.)