A286478 Ordinal transform of A034968, factorial base digit sum.

1, 1, 2, 1, 2, 1, 3, 3, 4, 2, 3, 1, 5, 4, 5, 2, 3, 1, 6, 4, 5, 2, 3, 1, 4, 6, 7, 7, 8, 6, 8, 9, 10, 7, 8, 4, 11, 9, 10, 5, 6, 2, 11, 7, 8, 3, 4, 1, 9, 12, 13, 12, 13, 9, 14, 14, 15, 10, 11, 5, 16, 12, 13, 6, 7, 2, 14, 8, 9, 3, 4, 1, 15, 17, 18, 15, 16, 10, 19, 17, 18, 11, 12, 5, 19, 13, 14, 6, 7, 2, 15, 8, 9, 3, 4, 1, 20, 20, 21, 16, 17, 10, 22, 18, 19, 11, 12

Offset

0,3

Links

Antti Karttunen, Table of n, a(n) for n = 0..10080

Index entries for sequences related to factorial base representation

Formula

For all n>= 1, a(A000142(n)) = n.

Mathematica

f[n_] := If[n == 0, 0, Module[{s = 0, i = 2, k = n},
     While[k>0, k = Floor[n/i!]; s += (i-1) k; i++]; n-s]];
b[_] = 1;
a[n_] := a[n] = With[{t = f[n]}, b[t]++];
a /@ Range[0, 100] (* Jean-François Alcover, Dec 19 2021 *)

Crossrefs

Cf. A000142, A034968, A254524 (base-10 analog).

Sequence in context: A213237 A029334 A275078 * A340756 A030273 A029197

Adjacent sequences: A286475 A286476 A286477 * A286479 A286480 A286481

Keyword

nonn,base

Author

Antti Karttunen, May 20 2017

Status

approved