A380465 Second coefficient of the lindep transform of A007947, squarefree kernel of n.

-1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, -1, 0

Offset

1

Comments

See A339791 for a definition of lindep-transform.

A059172 does not give the positions of 0's in this sequence, because this is not equal to A380439(n)-1. See comments in the latter.

Links

Antti Karttunen, Table of n, a(n) for n = 1..65537

Prog

(PARI)
A007947(n) = factorback(factorint(n)[, 1]); \\ From A007947
A380465(n) = { my(v=lindep([A007947(n), n, 1])); (v*sign(v[1]))[2]; };

Crossrefs

Cf. A007947, A380464, A380466.

Cf. also A339791, A380545.

Differs from A380439(n)-1 for the first time at n=261120.

Sequence in context: A307420 A129667 A071374 * A071025 A077010 A330548

Adjacent sequences: A380462 A380463 A380464 * A380466 A380467 A380468

Keyword

sign,new

Author

Antti Karttunen, Jan 27 2025

Status

approved