A327532 Indicator function for numbers whose prime indices are relatively prime (A289509).

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

Offset

1

Comments

First differs from A327515 at index 225.

A prime index of n is a number m such that prime(m) divides n. The multiset of prime indices of n is row n of A112798. After 2, the first connected number (A305078) with relatively prime prime indices is 195.

Links

Table of n, a(n) for n=1..87.

Gus Wiseman, Sequences counting and encoding certain classes of multisets

Mathematica

Table[Boole[GCD@@PrimePi/@First/@FactorInteger[n]==1], {n, 100}]

Crossrefs

See link for additional cross-references.

Positions of 0's are A318978.

Positions of 1's are A289509.

Cf. A112798, A281116, A289509, A318721.

Sequence in context: A131734 A134452 A327515 * A073445 A285589 A179081

Adjacent sequences: A327529 A327530 A327531 * A327533 A327534 A327535

Keyword

nonn

Author

Gus Wiseman, Sep 17 2019

Status

approved