OFFSET
1,4
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..65537
MATHEMATICA
A171462[n_] := If[n == 1, 0, Module[{f = FactorInteger[n], p},
p = f[[-1, 1]]; n(p-1)/p]];
b[_] = 0;
a[n_] := a[n] = With[{t = A171462[n]}, b[t] = b[t]+1];
Array[a, 105] (* Jean-François Alcover, Dec 21 2021 *)
PROG
(PARI)
up_to = 65537;
ordinal_transform(invec) = { my(om = Map(), outvec = vector(length(invec)), pt); for(i=1, length(invec), if(mapisdefined(om, invec[i]), pt = mapget(om, invec[i]), pt = 0); outvec[i] = (1+pt); mapput(om, invec[i], (1+pt))); outvec; };
A171462(n) = if(1==n, 0, (n-(n/vecmax(factor(n)[, 1]))));
v322872 = ordinal_transform(vector(up_to, n, A171462(n)));
A322872(n) = v322872[n];
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Dec 29 2018
STATUS
approved