A345941 a(n) = gcd(n, A329044(n)).

1, 2, 3, 4, 5, 3, 7, 2, 3, 5, 11, 3, 13, 7, 5, 4, 17, 9, 19, 5, 7, 11, 23, 3, 25, 13, 3, 7, 29, 5, 31, 2, 11, 17, 7, 9, 37, 19, 13, 5, 41, 7, 43, 11, 5, 23, 47, 3, 7, 25, 17, 13, 53, 9, 11, 7, 19, 29, 59, 5, 61, 31, 7, 4, 13, 11, 67, 17, 23, 7, 71, 9, 73, 37, 25, 19, 11, 13, 79, 5, 3, 41, 83, 7, 17, 43, 29, 11, 89

Offset

1,2

Comments

Only powers of primes (A000961) occur as terms. A346087 gives the exponents. - Antti Karttunen, Jul 07 2021

Links

Antti Karttunen, Table of n, a(n) for n = 1..20000

Index entries for sequences computed from indices in prime factorization

Index entries for sequences related to primorial base

Index entries for sequences related to primorial numbers

Formula

a(n) = gcd(n, A329044(n)).

a(n) = n / A345942(n).

a(n) = A329044(n) / A345943(n).

a(p) = p for all primes p.

From Antti Karttunen, Jul 07 2021: (Start)

a(n) = A006530(n)^A346087(n) = A006530(n)^min(A071178(n), A329348(n)).

a(n) = gcd(n, A346097(n)).

A006530(a(n)) = A020639(A329044(n)) = A006530(n).

(End)

Prog

(PARI) A345941(n) = gcd(n, A329044(n)); \\ Rest of program given in A329044.

Crossrefs

Cf. A000961, A006530, A020639, A071178, A108951, A324886, A329348, A329044, A345942, A345943, A346087, A346097.

Sequence in context: A366876 A330750 A346099 * A088492 A345931 A025492

Adjacent sequences: A345938 A345939 A345940 * A345942 A345943 A345944

Keyword

nonn

Author

Antti Karttunen, Jul 03 2021

Status

approved