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 A122804 Smallest positive number divisible by n which is not of the form a(i)+a(j) for i and j <= n-1. 5

%I

%S 1,4,3,12,10,12,21,32,9,40,55,48,26,28,45,112,17,108,114,180,63,132,

%T 23,168,150,104,270,28,145,150,186,128,99,170,70,252,370,266,39,400,

%U 328,252,301,352,495,92,188,576,245,150,408,468,106,486,165,784,342,406,649

%N Smallest positive number divisible by n which is not of the form a(i)+a(j) for i and j <= n-1.

%C Same as A122544, except that a(n) is allowed to take values already in the sequence.

%H Alois P. Heinz, <a href="/A122804/b122804.txt">Table of n, a(n) for n = 1..1000</a>

%t f[s_] := Block[{n, k},k = n = Length[s] + 1;While[MemberQ[Union[Plus @@@ Tuples[s, 2]], k], k += n];Append[s, k]];Nest[f, {1}, 60]

%Y Cf. A122537, A122544, A122805 (a(n)/n), A122806 (complement).

%K nonn

%O 1,2

%A _Ray Chandler_, Sep 23 2006

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Last modified May 17 17:52 EDT 2022. Contains 353778 sequences. (Running on oeis4.)