1,3

Antti Karttunen, Table of n, a(n) for n = 1..30030

Index entries for sequences related to primorial numbers

If A111701(n) == n, then a(n) = n, otherwise a(n) = a(A111701(n)).

a(n) = n / A328479(n).

(PARI)

A111701(n) = forprime(p=2, , if(n%p, return(n), n /= p));

A328478(n) = { my(u=A111701(n)); if(u==n, return(n), return(A328478(u))); };

Cf. A007814 (gives the number of iterations to reach a fixed point), A025487 (indices of 1's).

Cf. A002110, A053589, A111701, A328479.

Cf. also A093411 for analogous sequence.

Sequence in context: A339421 A336898 A300330 * A093411 A147088 A340083

Adjacent sequences: A328475 A328476 A328477 * A328479 A328480 A328481

nonn

Antti Karttunen, Oct 19 2019

Definition clarified by N. J. A. Sloane, Jan 19 2021

approved