A336850 a(n) = gcd(A003961(n), sigma(A003961(n))), where A003961 is the prime shift towards larger primes.

1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 15, 1, 3, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 3, 1, 13, 1, 3, 1, 3, 1, 3, 5, 9, 1, 3, 7, 3, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 5, 3, 1, 5, 1, 3, 1, 3, 1, 3, 1, 1, 1, 1, 1, 9, 1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 1, 3, 1, 1, 1, 3, 1, 15, 1, 9, 1

Offset

1,6

Links

Antti Karttunen, Table of n, a(n) for n = 1..16384

Antti Karttunen, Data supplement: n, a(n) computed for n = 1..65537

Index entries for sequences computed from indices in prime factorization

Index entries for sequences related to sigma(n)

Formula

a(n) = gcd(A003961(n), A003973(n)) = gcd(A003961(n), A336851(n)).

a(n) = A009194(A003961(n)).

a(n) = A003961(n) / A336849(n).

Prog

(PARI) A336850(n) = gcd(A003961(n), sigma(A003961(n)));

Crossrefs

Cf. A003961, A003973, A009194, A336849, A336851.

Sequence in context: A318668 A322361 A219208 * A061680 A355456 A097558

Adjacent sequences: A336847 A336848 A336849 * A336851 A336852 A336853

Keyword

nonn

Author

Antti Karttunen, Aug 05 2020

Status

approved