A328579 - OEIS

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A328579

a(n) = A053669(A276086(A276086(n))).

6

3, 2, 5, 2, 7, 2, 5, 2, 7, 2, 11, 2, 3, 2, 11, 2, 7, 2, 5, 2, 13, 2, 13, 2, 3, 2, 13, 2, 17, 2, 3, 2, 7, 2, 5, 2, 5, 2, 11, 2, 13, 2, 3, 2, 13, 2, 13, 2, 5, 2, 17, 2, 17, 2, 3, 2, 17, 2, 11, 2, 3, 2, 11, 2, 7, 2, 5, 2, 13, 2, 13, 2, 3, 2, 17, 2, 17, 2, 5, 2, 17, 2, 19, 2, 3, 2, 13, 2, 19, 2, 3, 2, 13, 2, 17, 2, 5, 2, 17, 2, 17, 2, 3, 2, 17, 2

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OFFSET

0,1

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..32768

Index entries for sequences related to primorial base

FORMULA

a(n) = A053669(A276087(n)).

a(n) = A326810(A276086(n)).

a(n) = A000040(A328578(n)).

For all even n, a(n) > A328569(n).

PROG

(PARI)

A276086(n) = { my(m=1, p=2); while(n, m *= (p^(n%p)); n = n\p; p = nextprime(1+p)); (m); };

A326810(n) = { my(i=1, p=2); while(n && (n%p), n = n\p; p = nextprime(1+p)); (p); };

A328579(n) = A326810(A276086(n));

(PARI)

A053669(n) = forprime(p=2, , if(n%p, return(p))); \\ From A053669

A328579(n) = A053669(A276086(A276086(n)));

CROSSREFS

Cf. A000040, A053669, A276086, A276087, A326810, A328569, A328578.

Sequence in context: A069735 A358536 A274457 * A046524 A086571 A350509

Adjacent sequences: A328576 A328577 A328578 * A328580 A328581 A328582

KEYWORD

nonn

AUTHOR

Antti Karttunen, Oct 20 2019

STATUS

approved