A371087 a(n) = 1 if A003557(n) divides A276086(n), otherwise a(n) = 0, where A003557(k) is k divided by its largest squarefree divisor, and A276086 is the primorial base exp-function.

1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0

Offset

1

Links

Antti Karttunen, Table of n, a(n) for n = 1..100000

Index entries for characteristic functions

Index entries for sequences related to primorial base

Formula

a(n) >= A008966(n).

a(n) >= A358220(n).

Prog

(PARI)
A003557(n) = (n/factorback(factor(n)[, 1]));
A276086(n) = { my(m=1, p=2); while(n, m *= (p^(n%p)); n = n\p; p = nextprime(1+p)); (m); };
A371087(n) = !(A276086(n)%A003557(n));

Crossrefs

Characteristic function of A371088, whose complement A371089 gives the positions of 0's.

Cf. A003557, A008966, A276086, A358220.

Sequence in context: A285373 A359543 A361121 * A353457 A359550 A112299

Adjacent sequences: A371084 A371085 A371086 * A371088 A371089 A371090

Keyword

nonn

Author

Antti Karttunen, Mar 12 2024

Status

approved