A079432 a(n) = A079431(A079431(n)).

4, 8, 9, 16, 20, 12, 28, 32, 15, 25, 44, 18, 52, 49, 21, 64, 68, 24, 76, 35, 27, 88, 92, 30, 40, 104, 33, 56, 116, 36, 124, 128, 39, 136, 50, 42, 148, 152, 45, 55, 164, 48, 172, 121, 51, 184, 188, 54, 77, 65, 57, 169, 212, 60, 70, 91, 63, 232, 236, 66, 244, 248, 69, 256

Offset: 1

Author

Reinhard Zumkeller, Jan 09 2003

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A078701, A079431.

Programs

Mathematica

f[n_] := FactorInteger[n/2^IntegerExponent[n, 2]][[1, 1]]; A079431[n_] := Module[{p = f[n], m}, m = n+p; While[f[m] != p, m+=p]; m]; a[n_] := A079431[A079431[n]]; Array[a, 100] (* Amiram Eldar, Mar 26 2025 *)

Formula

A078701(a(n)) = A078701(A079431(n)) = A078701(n).