A137673 Smallest m such that A137671(m) = n.

1, 3, 4, 6, 7, 9, 12, 14, 15, 20, 22, 28, 30, 32, 34, 41, 45, 47, 48, 50, 51, 54, 59, 62, 63, 67, 69, 71, 74, 76, 83, 87, 93, 94, 95, 99, 100, 107, 110, 113, 114, 116, 119, 128, 133, 135, 140, 142, 143, 150, 153, 155, 156, 161, 163, 166, 167, 170, 183, 186, 188, 191

Offset: 1

Author

Reinhard Zumkeller, Feb 05 2008

Keywords

• nonn
• base

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..2000

Crossrefs

Cf. A137671, A137674.

Programs

Mathematica

b[1] = 1; b[n_] := b[n] = Count[Array[s, n - 1], s[n - 1]]; s[n_] := s[n] = DigitCount[b[n], 2, 1]; seq[len_, nmax_] := Module[{t = Table[0, {len}], c = 0, n = 1, i}, While[c < len && n < nmax, i = b[n]; If[t[[i]] == 0, c++; t[[i]] = n]; n++]; t]; seq[100, 1000] (* Amiram Eldar, Jul 27 2023 *)

Formula

A137671(a(n)) = n and A137671(m) < n for m < a(n).

A137674(n) = a(A137671(A137674(n)-1)) + 1.