A030723 Numbers k such that A030717(k) = 1.

1, 2, 5, 10, 17, 22, 28, 35, 59, 60, 69, 70, 71, 72, 81, 84, 85, 94, 97, 98, 99, 100, 101, 110, 113, 115, 116, 117, 118, 119, 128, 131, 133, 134, 135, 136, 137, 139, 148, 151, 153, 154, 155, 156, 157, 158, 160, 161, 162, 171, 174

Offset: 1

Author

Clark Kimberling

Keywords

• nonn

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..10000
• Michael De Vlieger, Plot a(w(j) + k - 1) at (j,k) for j = 1..512 and w the sequence of partial sums of A030719, showing a(m) = 1 in red and a(m) > 1 in light blue.

Crossrefs

Cf. A030717, A030724, A030725, A030726.

Programs

Mathematica

nn = 102; c[] = 0; m = k = a[1] = c[1] = 1; {1}~Join~Reap[Do[w = Union@ Array[a, k]; Do[If[Set[a[j + k], c[w[[j]]]] == 1, Sow[j + k]], {j, Length[w]}]; Do[c[a[j + k]]++, {j, Length[w]}]; k += Length[w], {nn}]][[-1, -1]] (* _Michael De Vlieger, Nov 15 2022 *)