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

1, 4, 3, 12, 10, 12, 21, 32, 9, 40, 55, 48, 26, 28, 45, 112, 17, 108, 114, 180, 63, 132, 23, 168, 150, 104, 270, 28, 145, 150, 186, 128, 99, 170, 70, 252, 370, 266, 39, 400, 328, 252, 301, 352, 495, 92, 188, 576, 245, 150, 408, 468, 106, 486, 165, 784, 342, 406, 649

Offset: 1

Author

Ray Chandler, Sep 23 2006

Keywords

• nonn

Comments

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

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..1000

Crossrefs

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

Programs

Mathematica

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]