A328580 - OEIS

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A328580

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

5

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

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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