A328580 a(n) is the largest primorial dividing A276086(n), where A276086 converts the primorial base expansion of n into its prime product form.

1, 2, 1, 6, 1, 6, 1, 2, 1, 30, 1, 30, 1, 2, 1, 30, 1, 30, 1, 2, 1, 30, 1, 30, 1, 2, 1, 30, 1, 30, 1, 2, 1, 6, 1, 6, 1, 2, 1, 210, 1, 210, 1, 2, 1, 210, 1, 210, 1, 2, 1, 210, 1, 210, 1, 2, 1, 210, 1, 210, 1, 2, 1, 6, 1, 6, 1, 2, 1, 210, 1, 210, 1, 2, 1, 210, 1, 210, 1, 2, 1, 210, 1, 210, 1, 2, 1, 210, 1, 210

Offset

0,2

Links

Antti Karttunen, Table of n, a(n) for n = 0..2559

Index entries for sequences related to primorial base

Formula

a(n) = A053589(A276086(n)).

a(n) = A002110(A328570(n)-1).

a(n) = A276086(n) / A328475(n).

a(n) = A276086(n) - A328476(n).

A328476(n) / a(n) = A328475(n) - 1.

Prog

(PARI) A328580(n) = { my(i=1, p=2, pr=1); while(n && (n%p), pr *= p; n = n\p; p = nextprime(1+p)); (pr); };

Crossrefs

Cf. A002110, A053589, A276086, A326810, A328475, A328476, A328570.

Sequence in context: A335023 A205959 A318503 * A362784 A088123 A050932

Adjacent sequences: A328577 A328578 A328579 * A328581 A328582 A328583

Keyword

nonn

Author

Antti Karttunen, Oct 20 2019

Status

approved